<?xml version="1.0" encoding="US-ASCII"?>
<!--XBRL Document Created with Wdesk from Workiva-->
<!-- -->
<link:linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <link:roleRef roleURI="http://www.activision.com/role/AccumulatedOtherComprehensiveIncomeLoss" xlink:href="atvi-20191231.xsd#AccumulatedOtherComprehensiveIncomeLoss" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/AccumulatedOtherComprehensiveIncomeLossDetails" xlink:href="atvi-20191231.xsd#AccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/AccumulatedOtherComprehensiveIncomeLossTables" xlink:href="atvi-20191231.xsd#AccumulatedOtherComprehensiveIncomeLossTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/CapitalTransactions" xlink:href="atvi-20191231.xsd#CapitalTransactions" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/CapitalTransactionsDividendsDetails" xlink:href="atvi-20191231.xsd#CapitalTransactionsDividendsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/CapitalTransactionsRepurchaseProgramsDetails" xlink:href="atvi-20191231.xsd#CapitalTransactionsRepurchaseProgramsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/CashAndCashEquivalents" xlink:href="atvi-20191231.xsd#CashAndCashEquivalents" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/CashAndCashEquivalentsDetails" xlink:href="atvi-20191231.xsd#CashAndCashEquivalentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/CashAndCashEquivalentsTables" xlink:href="atvi-20191231.xsd#CashAndCashEquivalentsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/CommitmentsAndContingencies" xlink:href="atvi-20191231.xsd#CommitmentsAndContingencies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/CommitmentsAndContingenciesFutureMinimumCommitmentsDetails" xlink:href="atvi-20191231.xsd#CommitmentsAndContingenciesFutureMinimumCommitmentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/CommitmentsAndContingenciesNarrativeDetails" xlink:href="atvi-20191231.xsd#CommitmentsAndContingenciesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/CommitmentsAndContingenciesTables" xlink:href="atvi-20191231.xsd#CommitmentsAndContingenciesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/ComputationOfBasicDilutedEarningsPerCommonShare" xlink:href="atvi-20191231.xsd#ComputationOfBasicDilutedEarningsPerCommonShare" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/ComputationOfBasicDilutedEarningsPerCommonShareDetails" xlink:href="atvi-20191231.xsd#ComputationOfBasicDilutedEarningsPerCommonShareDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/ComputationOfBasicDilutedEarningsPerCommonShareTables" xlink:href="atvi-20191231.xsd#ComputationOfBasicDilutedEarningsPerCommonShareTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/ComputationOfBasicDilutedEarningsPerCommonShareWeightedAverageSharesExcludedFromComputationOfDilutedEarningsPerShareDetails" xlink:href="atvi-20191231.xsd#ComputationOfBasicDilutedEarningsPerCommonShareWeightedAverageSharesExcludedFromComputationOfDilutedEarningsPerShareDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/ConsolidatedBalanceSheets" xlink:href="atvi-20191231.xsd#ConsolidatedBalanceSheets" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:href="atvi-20191231.xsd#ConsolidatedBalanceSheetsParenthetical" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/ConsolidatedStatementsOfCashFlows" xlink:href="atvi-20191231.xsd#ConsolidatedStatementsOfCashFlows" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/ConsolidatedStatementsOfChangesInShareholdersEquity" xlink:href="atvi-20191231.xsd#ConsolidatedStatementsOfChangesInShareholdersEquity" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/ConsolidatedStatementsOfChangesInShareholdersEquityParenthetical" xlink:href="atvi-20191231.xsd#ConsolidatedStatementsOfChangesInShareholdersEquityParenthetical" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/ConsolidatedStatementsOfComprehensiveIncome" xlink:href="atvi-20191231.xsd#ConsolidatedStatementsOfComprehensiveIncome" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/ConsolidatedStatementsOfOperations" xlink:href="atvi-20191231.xsd#ConsolidatedStatementsOfOperations" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/CoverPage" xlink:href="atvi-20191231.xsd#CoverPage" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/Debt" xlink:href="atvi-20191231.xsd#Debt" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/DebtCreditFacilitiesDetails" xlink:href="atvi-20191231.xsd#DebtCreditFacilitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/DebtDebtFairValueDetails" xlink:href="atvi-20191231.xsd#DebtDebtFairValueDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/DebtScheduleOfMaturitiesDetails" xlink:href="atvi-20191231.xsd#DebtScheduleOfMaturitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/DebtSummaryOfDebtDetails" xlink:href="atvi-20191231.xsd#DebtSummaryOfDebtDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/DebtTables" xlink:href="atvi-20191231.xsd#DebtTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/DebtUnsecuredSeniorNotesAndInterestExpenseAndFinancingCostsDetails" xlink:href="atvi-20191231.xsd#DebtUnsecuredSeniorNotesAndInterestExpenseAndFinancingCostsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/DeferredRevenues" xlink:href="atvi-20191231.xsd#DeferredRevenues" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/DeferredRevenuesDetails" xlink:href="atvi-20191231.xsd#DeferredRevenuesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/DeferredRevenuesRemainingPerformanceObligationDetails" xlink:href="atvi-20191231.xsd#DeferredRevenuesRemainingPerformanceObligationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/DescriptionOfBusiness" xlink:href="atvi-20191231.xsd#DescriptionOfBusiness" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/DescriptionOfBusinessDetails" xlink:href="atvi-20191231.xsd#DescriptionOfBusinessDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/FairValueMeasurements" xlink:href="atvi-20191231.xsd#FairValueMeasurements" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/FairValueMeasurementsForeignCurrencyForwardContractsDetails" xlink:href="atvi-20191231.xsd#FairValueMeasurementsForeignCurrencyForwardContractsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/FairValueMeasurementsNonRecurringBasisDetails" xlink:href="atvi-20191231.xsd#FairValueMeasurementsNonRecurringBasisDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/FairValueMeasurementsRecurringBasisDetails" xlink:href="atvi-20191231.xsd#FairValueMeasurementsRecurringBasisDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/FairValueMeasurementsTables" xlink:href="atvi-20191231.xsd#FairValueMeasurementsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/Goodwill" xlink:href="atvi-20191231.xsd#Goodwill" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/GoodwillDetails" xlink:href="atvi-20191231.xsd#GoodwillDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/GoodwillTables" xlink:href="atvi-20191231.xsd#GoodwillTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/IncomeTaxes" xlink:href="atvi-20191231.xsd#IncomeTaxes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/IncomeTaxesComponentsOfNetDeferredTaxAssetsLiabilitiesDetails" xlink:href="atvi-20191231.xsd#IncomeTaxesComponentsOfNetDeferredTaxAssetsLiabilitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/IncomeTaxesEffectiveTaxRateReconciliationDetails" xlink:href="atvi-20191231.xsd#IncomeTaxesEffectiveTaxRateReconciliationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/IncomeTaxesIncomeLossBeforeIncomeTaxesAndIncomeTaxExpenseBenefitDetails" xlink:href="atvi-20191231.xsd#IncomeTaxesIncomeLossBeforeIncomeTaxesAndIncomeTaxExpenseBenefitDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/IncomeTaxesNarrativeDetails" xlink:href="atvi-20191231.xsd#IncomeTaxesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/IncomeTaxesReconciliationOfTotalGrossUnrecognizedTaxBenefitsDetails" xlink:href="atvi-20191231.xsd#IncomeTaxesReconciliationOfTotalGrossUnrecognizedTaxBenefitsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/IncomeTaxesTables" xlink:href="atvi-20191231.xsd#IncomeTaxesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/IntangibleAssetsNet" xlink:href="atvi-20191231.xsd#IntangibleAssetsNet" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/IntangibleAssetsNetDetails" xlink:href="atvi-20191231.xsd#IntangibleAssetsNetDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/IntangibleAssetsNetFutureAmortizationScheduleDetails" xlink:href="atvi-20191231.xsd#IntangibleAssetsNetFutureAmortizationScheduleDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/IntangibleAssetsNetTables" xlink:href="atvi-20191231.xsd#IntangibleAssetsNetTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/InterestAndOtherExpenseIncomeNet" xlink:href="atvi-20191231.xsd#InterestAndOtherExpenseIncomeNet" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/InterestAndOtherExpenseIncomeNetDetails" xlink:href="atvi-20191231.xsd#InterestAndOtherExpenseIncomeNetDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/InterestAndOtherExpenseIncomeNetTables" xlink:href="atvi-20191231.xsd#InterestAndOtherExpenseIncomeNetTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/Leases" xlink:href="atvi-20191231.xsd#Leases" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/LeasesFutureMinimumLeasePaymentsPriorToAdoptionOfLeaseStandardDetails" xlink:href="atvi-20191231.xsd#LeasesFutureMinimumLeasePaymentsPriorToAdoptionOfLeaseStandardDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/LeasesNarrativeDetails" xlink:href="atvi-20191231.xsd#LeasesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/LeasesScheduleOfFutureLeasePaymentsUnderNonCancellableOperatingLeasesDetails" xlink:href="atvi-20191231.xsd#LeasesScheduleOfFutureLeasePaymentsUnderNonCancellableOperatingLeasesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/LeasesScheduleOfLeaseExpenseAndOtherDetailsRelatedToOperatingLeasesDetails" xlink:href="atvi-20191231.xsd#LeasesScheduleOfLeaseExpenseAndOtherDetailsRelatedToOperatingLeasesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/LeasesScheduleOfOperatingRouAssetsAndLeaseLiabilitiesDetails" xlink:href="atvi-20191231.xsd#LeasesScheduleOfOperatingRouAssetsAndLeaseLiabilitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/LeasesTables" xlink:href="atvi-20191231.xsd#LeasesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/OperatingSegmentsAndGeographicRegions" xlink:href="atvi-20191231.xsd#OperatingSegmentsAndGeographicRegions" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/OperatingSegmentsAndGeographicRegionsDetails" xlink:href="atvi-20191231.xsd#OperatingSegmentsAndGeographicRegionsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/OperatingSegmentsAndGeographicRegionsTables" xlink:href="atvi-20191231.xsd#OperatingSegmentsAndGeographicRegionsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/OtherAssetsAndLiabilities" xlink:href="atvi-20191231.xsd#OtherAssetsAndLiabilities" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/OtherAssetsAndLiabilitiesDetails" xlink:href="atvi-20191231.xsd#OtherAssetsAndLiabilitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/PropertyAndEquipmentNet" xlink:href="atvi-20191231.xsd#PropertyAndEquipmentNet" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/PropertyAndEquipmentNetDetails" xlink:href="atvi-20191231.xsd#PropertyAndEquipmentNetDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/PropertyAndEquipmentNetTables" xlink:href="atvi-20191231.xsd#PropertyAndEquipmentNetTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/QuarterlyFinancialInformationUnaudited" xlink:href="atvi-20191231.xsd#QuarterlyFinancialInformationUnaudited" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/QuarterlyFinancialInformationUnauditedDetails" xlink:href="atvi-20191231.xsd#QuarterlyFinancialInformationUnauditedDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/QuarterlyFinancialInformationUnauditedTables" xlink:href="atvi-20191231.xsd#QuarterlyFinancialInformationUnauditedTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/RecentlyIssuedAccountingPronouncements" xlink:href="atvi-20191231.xsd#RecentlyIssuedAccountingPronouncements" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/RecentlyIssuedAccountingPronouncementsScheduleOfImpactOfAdoptionOnConsolidatedBalanceSheetDetails" xlink:href="atvi-20191231.xsd#RecentlyIssuedAccountingPronouncementsScheduleOfImpactOfAdoptionOnConsolidatedBalanceSheetDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/RecentlyIssuedAccountingPronouncementsTables" xlink:href="atvi-20191231.xsd#RecentlyIssuedAccountingPronouncementsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/Restructuring" xlink:href="atvi-20191231.xsd#Restructuring" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/RestructuringNarrativeDetails" xlink:href="atvi-20191231.xsd#RestructuringNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/RestructuringScheduleOfAccruedRestructuringIncludedInAccruedExpensesAndOtherLiabilitiesByCostTypeDetails" xlink:href="atvi-20191231.xsd#RestructuringScheduleOfAccruedRestructuringIncludedInAccruedExpensesAndOtherLiabilitiesByCostTypeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/RestructuringScheduleOfTotalExpectedPreTaxRestructuringChargesDetails" xlink:href="atvi-20191231.xsd#RestructuringScheduleOfTotalExpectedPreTaxRestructuringChargesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/RestructuringTables" xlink:href="atvi-20191231.xsd#RestructuringTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/RestructuringTotalRestructuringAndRelatedCostsBySegmentDetails" xlink:href="atvi-20191231.xsd#RestructuringTotalRestructuringAndRelatedCostsBySegmentDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/ScheduleIiValuationAndQualifyingAccounts" xlink:href="atvi-20191231.xsd#ScheduleIiValuationAndQualifyingAccounts" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/ScheduleIiValuationAndQualifyingAccountsDetails" xlink:href="atvi-20191231.xsd#ScheduleIiValuationAndQualifyingAccountsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/ShareBasedPayments" xlink:href="atvi-20191231.xsd#ShareBasedPayments" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/ShareBasedPaymentsEquityIncentivePlansDetails" xlink:href="atvi-20191231.xsd#ShareBasedPaymentsEquityIncentivePlansDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/ShareBasedPaymentsMethodAndAssumptionsOnValuationOfStockOptionsAndAwardsDetails" xlink:href="atvi-20191231.xsd#ShareBasedPaymentsMethodAndAssumptionsOnValuationOfStockOptionsAndAwardsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/ShareBasedPaymentsRestrictedStockUnitsAndRestrictedStockAwardsActivitiesDetails" xlink:href="atvi-20191231.xsd#ShareBasedPaymentsRestrictedStockUnitsAndRestrictedStockAwardsActivitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/ShareBasedPaymentsStockBasedCompensationExpenseDetails" xlink:href="atvi-20191231.xsd#ShareBasedPaymentsStockBasedCompensationExpenseDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/ShareBasedPaymentsStockOptionActivitiesDetails" xlink:href="atvi-20191231.xsd#ShareBasedPaymentsStockOptionActivitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/ShareBasedPaymentsTables" xlink:href="atvi-20191231.xsd#ShareBasedPaymentsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/SoftwareDevelopmentAndIntellectualPropertyLicenses" xlink:href="atvi-20191231.xsd#SoftwareDevelopmentAndIntellectualPropertyLicenses" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/SoftwareDevelopmentAndIntellectualPropertyLicensesDetails" xlink:href="atvi-20191231.xsd#SoftwareDevelopmentAndIntellectualPropertyLicensesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/SoftwareDevelopmentAndIntellectualPropertyLicensesTables" xlink:href="atvi-20191231.xsd#SoftwareDevelopmentAndIntellectualPropertyLicensesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/SummaryOfSignificantAccountingPolicies" xlink:href="atvi-20191231.xsd#SummaryOfSignificantAccountingPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/SummaryOfSignificantAccountingPoliciesAdvertisingExpensesDetails" xlink:href="atvi-20191231.xsd#SummaryOfSignificantAccountingPoliciesAdvertisingExpensesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/SummaryOfSignificantAccountingPoliciesDefiniteLivedIntangibleAssetsDetails" xlink:href="atvi-20191231.xsd#SummaryOfSignificantAccountingPoliciesDefiniteLivedIntangibleAssetsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/SummaryOfSignificantAccountingPoliciesDetails" xlink:href="atvi-20191231.xsd#SummaryOfSignificantAccountingPoliciesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/SummaryOfSignificantAccountingPoliciesEstimatedServicePeriodDetails" xlink:href="atvi-20191231.xsd#SummaryOfSignificantAccountingPoliciesEstimatedServicePeriodDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/SummaryOfSignificantAccountingPoliciesGoodwillAndOtherIndefiniteLivedAssetsDetails" xlink:href="atvi-20191231.xsd#SummaryOfSignificantAccountingPoliciesGoodwillAndOtherIndefiniteLivedAssetsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/SummaryOfSignificantAccountingPoliciesLongLivedAssetsDetails" xlink:href="atvi-20191231.xsd#SummaryOfSignificantAccountingPoliciesLongLivedAssetsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/SummaryOfSignificantAccountingPoliciesPolicies" xlink:href="atvi-20191231.xsd#SummaryOfSignificantAccountingPoliciesPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/SummaryOfSignificantAccountingPoliciesRevenueRecognitionDetails" xlink:href="atvi-20191231.xsd#SummaryOfSignificantAccountingPoliciesRevenueRecognitionDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/SupplementalCashFlowInformation" xlink:href="atvi-20191231.xsd#SupplementalCashFlowInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/SupplementalCashFlowInformationDetails" xlink:href="atvi-20191231.xsd#SupplementalCashFlowInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.activision.com/role/SupplementalCashFlowInformationTables" xlink:href="atvi-20191231.xsd#SupplementalCashFlowInformationTables" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" xlink:type="simple" />
  <link:definitionLink xlink:role="http://www.activision.com/role/AccumulatedOtherComprehensiveIncomeLoss" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/AccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_3C84315E45263402DD8C0FDF6CE19ADD" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_4CCC4345E6C2E21BFFD20FDF6CDFC523" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_3C84315E45263402DD8C0FDF6CE19ADD" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_4CCC4345E6C2E21BFFD20FDF6CDFC523" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_141EF61F575B62ADC0E90FDF6CE093C8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_4CCC4345E6C2E21BFFD20FDF6CDFC523" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_141EF61F575B62ADC0E90FDF6CE093C8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_FBECB9FAA96502BF7F0D0FDF6CE0739C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_141EF61F575B62ADC0E90FDF6CE093C8" xlink:to="loc_us-gaap_EquityComponentDomain_FBECB9FAA96502BF7F0D0FDF6CE0739C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_FBECB9FAA96502BF7F0D0FDF6CE0739C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_141EF61F575B62ADC0E90FDF6CE093C8" xlink:to="loc_us-gaap_EquityComponentDomain_FBECB9FAA96502BF7F0D0FDF6CE0739C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_27E946D1ED0444B69D1F0FDF6CE04E67" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_FBECB9FAA96502BF7F0D0FDF6CE0739C" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_27E946D1ED0444B69D1F0FDF6CE04E67" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedTranslationAdjustmentMember" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_88FEA93B00B931DCB8CC0FDF6CE0A86A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_27E946D1ED0444B69D1F0FDF6CE04E67" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_88FEA93B00B931DCB8CC0FDF6CE0A86A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember" xlink:label="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_F2CCF752385A545C7C410FDF6CE1A9ED" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_27E946D1ED0444B69D1F0FDF6CE04E67" xlink:to="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_F2CCF752385A545C7C410FDF6CE1A9ED" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember" xlink:label="loc_us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember_C3CEE103C09274D797750FDF6CE1B5C2" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_27E946D1ED0444B69D1F0FDF6CE04E67" xlink:to="loc_us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember_C3CEE103C09274D797750FDF6CE1B5C2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AOCIAttributableToParentNetOfTaxRollForward" xlink:label="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_AB4E7BAE0F2A22BA39EC0FDF6CE1684B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_3C84315E45263402DD8C0FDF6CE19ADD" xlink:to="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_AB4E7BAE0F2A22BA39EC0FDF6CE1684B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_08CEFC7CB0BCB9B029E60FDF6CE1BFD7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_AB4E7BAE0F2A22BA39EC0FDF6CE1684B" xlink:to="loc_us-gaap_StockholdersEquity_08CEFC7CB0BCB9B029E60FDF6CE1BFD7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption" xlink:label="loc_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_D6CE433A4075281D61840FDF6CE29000" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_AB4E7BAE0F2A22BA39EC0FDF6CE1684B" xlink:to="loc_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_D6CE433A4075281D61840FDF6CE29000" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent" xlink:label="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_179E5FDB7AB815D430340FDF6CE23698" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_AB4E7BAE0F2A22BA39EC0FDF6CE1684B" xlink:to="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_179E5FDB7AB815D430340FDF6CE23698" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_6D1FCB2352A9408517B50FDF6CE2CA28" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_AB4E7BAE0F2A22BA39EC0FDF6CE1684B" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_6D1FCB2352A9408517B50FDF6CE2CA28" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/AccumulatedOtherComprehensiveIncomeLossTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/CapitalTransactions" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/CapitalTransactionsDividendsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockLineItems" xlink:label="loc_us-gaap_ClassOfStockLineItems_7672B36A9519C144ACB8A8BC6BDC647E" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfStockByClassTable" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_EB987ADA1828650137C0A8BC6BDB4925" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_7672B36A9519C144ACB8A8BC6BDC647E" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_EB987ADA1828650137C0A8BC6BDB4925" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_3F6A3B117C8AD4346E85A8BC6BDBCED0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_EB987ADA1828650137C0A8BC6BDB4925" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_3F6A3B117C8AD4346E85A8BC6BDBCED0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_A7CECD14CA789AE9C1A6A8BC6BDB875C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_3F6A3B117C8AD4346E85A8BC6BDBCED0" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_A7CECD14CA789AE9C1A6A8BC6BDB875C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_A7CECD14CA789AE9C1A6A8BC6BDB875C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_3F6A3B117C8AD4346E85A8BC6BDBCED0" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_A7CECD14CA789AE9C1A6A8BC6BDB875C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_us-gaap_SubsequentEventMember_AC8DBE1FDBA447E7DF01A8BC6BDCAC99" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_A7CECD14CA789AE9C1A6A8BC6BDB875C" xlink:to="loc_us-gaap_SubsequentEventMember_AC8DBE1FDBA447E7DF01A8BC6BDCAC99" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockDividendsPerShareDeclared" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared_BD03E0342D6562C5A72CA8BC6BDCA305" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_7672B36A9519C144ACB8A8BC6BDC647E" xlink:to="loc_us-gaap_CommonStockDividendsPerShareDeclared_BD03E0342D6562C5A72CA8BC6BDCA305" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsOfDividendsCommonStock" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_E27C48B5D0CFC8F5531BA8BC6BDCD81D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_7672B36A9519C144ACB8A8BC6BDC647E" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_E27C48B5D0CFC8F5531BA8BC6BDCD81D" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_PaymentsOfDividendsRestrictedStockUnits" xlink:label="loc_atvi_PaymentsOfDividendsRestrictedStockUnits_B1A938C1CBB8B1EA973CA8BC6BDDBE1F" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_7672B36A9519C144ACB8A8BC6BDC647E" xlink:to="loc_atvi_PaymentsOfDividendsRestrictedStockUnits_B1A938C1CBB8B1EA973CA8BC6BDDBE1F" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/CapitalTransactionsRepurchaseProgramsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityClassOfTreasuryStockLineItems" xlink:label="loc_us-gaap_EquityClassOfTreasuryStockLineItems_0FF8CD2A52185B12098BF84BF71CE987" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfTreasuryStockTable" xlink:label="loc_us-gaap_ClassOfTreasuryStockTable_F0B70D5998AF14EC829BF84BF71A9928" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_0FF8CD2A52185B12098BF84BF71CE987" xlink:to="loc_us-gaap_ClassOfTreasuryStockTable_F0B70D5998AF14EC829BF84BF71A9928" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_73FC799C50540B4987EAF84BF71B21D4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfTreasuryStockTable_F0B70D5998AF14EC829BF84BF71A9928" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_73FC799C50540B4987EAF84BF71B21D4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_995A594B561C7642B12BF84BF71B695F_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_73FC799C50540B4987EAF84BF71B21D4" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_995A594B561C7642B12BF84BF71B695F_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_995A594B561C7642B12BF84BF71B695F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_73FC799C50540B4987EAF84BF71B21D4" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_995A594B561C7642B12BF84BF71B695F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_us-gaap_SubsequentEventMember_44AB4DB307AD36B6942FF84BF71B94E0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_995A594B561C7642B12BF84BF71B695F" xlink:to="loc_us-gaap_SubsequentEventMember_44AB4DB307AD36B6942FF84BF71B94E0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareRepurchaseProgramAxis" xlink:label="loc_us-gaap_ShareRepurchaseProgramAxis_7385DE50F090BA9C8D15F84BF71C00F7" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfTreasuryStockTable_F0B70D5998AF14EC829BF84BF71A9928" xlink:to="loc_us-gaap_ShareRepurchaseProgramAxis_7385DE50F090BA9C8D15F84BF71C00F7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareRepurchaseProgramDomain" xlink:label="loc_us-gaap_ShareRepurchaseProgramDomain_DA09156559E9AF17ADA0F84BF71CB7A6_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShareRepurchaseProgramAxis_7385DE50F090BA9C8D15F84BF71C00F7" xlink:to="loc_us-gaap_ShareRepurchaseProgramDomain_DA09156559E9AF17ADA0F84BF71CB7A6_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareRepurchaseProgramDomain" xlink:label="loc_us-gaap_ShareRepurchaseProgramDomain_DA09156559E9AF17ADA0F84BF71CB7A6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShareRepurchaseProgramAxis_7385DE50F090BA9C8D15F84BF71C00F7" xlink:to="loc_us-gaap_ShareRepurchaseProgramDomain_DA09156559E9AF17ADA0F84BF71CB7A6" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_ShareRepurchaseProgram2019Member" xlink:label="loc_atvi_ShareRepurchaseProgram2019Member_9E85825DCF383CF3069DF84BF71CDF59" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareRepurchaseProgramDomain_DA09156559E9AF17ADA0F84BF71CB7A6" xlink:to="loc_atvi_ShareRepurchaseProgram2019Member_9E85825DCF383CF3069DF84BF71CDF59" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_ShareRepurchaseProgram2017Member" xlink:label="loc_atvi_ShareRepurchaseProgram2017Member_C9890BC7DF0DB87FC0F3F84BF71C5245" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareRepurchaseProgramDomain_DA09156559E9AF17ADA0F84BF71CB7A6" xlink:to="loc_atvi_ShareRepurchaseProgram2017Member_C9890BC7DF0DB87FC0F3F84BF71C5245" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockRepurchaseProgramAuthorizedAmount1" xlink:label="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_CDE090E0F7BFF6307184F84BF71D8F1F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_0FF8CD2A52185B12098BF84BF71CE987" xlink:to="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_CDE090E0F7BFF6307184F84BF71D8F1F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_1D5C404124D4CA2F8BB2F84BF71DC6DC" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_0FF8CD2A52185B12098BF84BF71CE987" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_1D5C404124D4CA2F8BB2F84BF71DC6DC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TreasuryStockSharesAcquired" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_12505D0D42C5F592B48FF84BF71D5EA7" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_0FF8CD2A52185B12098BF84BF71CE987" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_12505D0D42C5F592B48FF84BF71D5EA7" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/CashAndCashEquivalents" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/CashAndCashEquivalentsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/CashAndCashEquivalentsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/CommitmentsAndContingencies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/CommitmentsAndContingenciesFutureMinimumCommitmentsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermPurchaseCommitmentLineItems" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentLineItems_89C5FEC65BC6D95415266A5DE6A167BA" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermPurchaseCommitmentTable" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentTable_FA97141C3478C2E7159F6A5DE69F74DF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_89C5FEC65BC6D95415266A5DE6A167BA" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentTable_FA97141C3478C2E7159F6A5DE69F74DF" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_D3CB2850D3BA857FD0666A5DE69FE009" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentTable_FA97141C3478C2E7159F6A5DE69F74DF" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_D3CB2850D3BA857FD0666A5DE69FE009" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_97210E6165E5B669B6B36A5DE69FE18B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_D3CB2850D3BA857FD0666A5DE69FE009" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_97210E6165E5B669B6B36A5DE69FE18B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_97210E6165E5B669B6B36A5DE69FE18B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_D3CB2850D3BA857FD0666A5DE69FE009" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_97210E6165E5B669B6B36A5DE69FE18B" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_ContractualObligationsNonCancelableOperatingLeaseMember" xlink:label="loc_atvi_ContractualObligationsNonCancelableOperatingLeaseMember_FA7E511C6A62D651F1896A5DE6A00738" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_97210E6165E5B669B6B36A5DE69FE18B" xlink:to="loc_atvi_ContractualObligationsNonCancelableOperatingLeaseMember_FA7E511C6A62D651F1896A5DE6A00738" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_FacilityAndEquipmentLeasesMember" xlink:label="loc_atvi_FacilityAndEquipmentLeasesMember_503FE27D5A77E4D3BF116A5DE6A04D05" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_ContractualObligationsNonCancelableOperatingLeaseMember_FA7E511C6A62D651F1896A5DE6A00738" xlink:to="loc_atvi_FacilityAndEquipmentLeasesMember_503FE27D5A77E4D3BF116A5DE6A04D05" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_DeveloperandHostingMember" xlink:label="loc_atvi_DeveloperandHostingMember_157DED4D4DFF6BB0EB266A5DE6A0C84B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_ContractualObligationsNonCancelableOperatingLeaseMember_FA7E511C6A62D651F1896A5DE6A00738" xlink:to="loc_atvi_DeveloperandHostingMember_157DED4D4DFF6BB0EB266A5DE6A0C84B" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_MarketingCommitmentsMember" xlink:label="loc_atvi_MarketingCommitmentsMember_A5654DDCCB47E4C142F56A5DE6A070C2" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_ContractualObligationsNonCancelableOperatingLeaseMember_FA7E511C6A62D651F1896A5DE6A00738" xlink:to="loc_atvi_MarketingCommitmentsMember_A5654DDCCB47E4C142F56A5DE6A070C2" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_LongTermDebtObligationsMember" xlink:label="loc_atvi_LongTermDebtObligationsMember_5A82830A1ACB2DC713B16A5DE6A1650D" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_ContractualObligationsNonCancelableOperatingLeaseMember_FA7E511C6A62D651F1896A5DE6A00738" xlink:to="loc_atvi_LongTermDebtObligationsMember_5A82830A1ACB2DC713B16A5DE6A1650D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractualObligationDueInNextTwelveMonths" xlink:label="loc_us-gaap_ContractualObligationDueInNextTwelveMonths_FF7BC6D530D1AA45EB586A5DE6A1A265" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_89C5FEC65BC6D95415266A5DE6A167BA" xlink:to="loc_us-gaap_ContractualObligationDueInNextTwelveMonths_FF7BC6D530D1AA45EB586A5DE6A1A265" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractualObligationDueInSecondYear" xlink:label="loc_us-gaap_ContractualObligationDueInSecondYear_CC3223D86336644052A16A5DE6A1D5E6" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_89C5FEC65BC6D95415266A5DE6A167BA" xlink:to="loc_us-gaap_ContractualObligationDueInSecondYear_CC3223D86336644052A16A5DE6A1D5E6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractualObligationDueInThirdYear" xlink:label="loc_us-gaap_ContractualObligationDueInThirdYear_7EB17F36637B3ACF16036A5DE6A108A6" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_89C5FEC65BC6D95415266A5DE6A167BA" xlink:to="loc_us-gaap_ContractualObligationDueInThirdYear_7EB17F36637B3ACF16036A5DE6A108A6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractualObligationDueInFourthYear" xlink:label="loc_us-gaap_ContractualObligationDueInFourthYear_96923001B62621E7E29B6A5DE6A1CD9C" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_89C5FEC65BC6D95415266A5DE6A167BA" xlink:to="loc_us-gaap_ContractualObligationDueInFourthYear_96923001B62621E7E29B6A5DE6A1CD9C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractualObligationDueInFifthYear" xlink:label="loc_us-gaap_ContractualObligationDueInFifthYear_25EB0C985F70E22201996A5DE6A269EE" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_89C5FEC65BC6D95415266A5DE6A167BA" xlink:to="loc_us-gaap_ContractualObligationDueInFifthYear_25EB0C985F70E22201996A5DE6A269EE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractualObligationDueAfterFifthYear" xlink:label="loc_us-gaap_ContractualObligationDueAfterFifthYear_21008F27DAC921BD19C86A5DE6A2973B" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_89C5FEC65BC6D95415266A5DE6A167BA" xlink:to="loc_us-gaap_ContractualObligationDueAfterFifthYear_21008F27DAC921BD19C86A5DE6A2973B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractualObligation" xlink:label="loc_us-gaap_ContractualObligation_FF11DAC6D3A6C7495BA96A5DE6A25485" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_89C5FEC65BC6D95415266A5DE6A167BA" xlink:to="loc_us-gaap_ContractualObligation_FF11DAC6D3A6C7495BA96A5DE6A25485" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_UnrecognizedTaxBenefitsNetNoncurrent" xlink:label="loc_atvi_UnrecognizedTaxBenefitsNetNoncurrent_6156075800DBC3E836476A5DE6A2F66D" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_89C5FEC65BC6D95415266A5DE6A167BA" xlink:to="loc_atvi_UnrecognizedTaxBenefitsNetNoncurrent_6156075800DBC3E836476A5DE6A2F66D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TaxCutsAndJobsActOf2017TransitionTaxForAccumulatedForeignEarningsLiability" xlink:label="loc_us-gaap_TaxCutsAndJobsActOf2017TransitionTaxForAccumulatedForeignEarningsLiability_7BF842013B854A9B03D86A5DE6A284B1" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_89C5FEC65BC6D95415266A5DE6A167BA" xlink:to="loc_us-gaap_TaxCutsAndJobsActOf2017TransitionTaxForAccumulatedForeignEarningsLiability_7BF842013B854A9B03D86A5DE6A284B1" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/CommitmentsAndContingenciesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LossContingenciesLineItems" xlink:label="loc_us-gaap_LossContingenciesLineItems_3D1ED6FE33190E5A35DD7EF14ABDF101" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LossContingenciesTable" xlink:label="loc_us-gaap_LossContingenciesTable_2C53AC38F2800B90698E7EF14AB93CB8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_3D1ED6FE33190E5A35DD7EF14ABDF101" xlink:to="loc_us-gaap_LossContingenciesTable_2C53AC38F2800B90698E7EF14AB93CB8" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_49CCCF0B2A1A5741317C7EF14AB91272" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_2C53AC38F2800B90698E7EF14AB93CB8" xlink:to="loc_us-gaap_DebtInstrumentAxis_49CCCF0B2A1A5741317C7EF14AB91272" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_61C654F7F647A1C559B57EF14AB9ECA6_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_49CCCF0B2A1A5741317C7EF14AB91272" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_61C654F7F647A1C559B57EF14AB9ECA6_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_61C654F7F647A1C559B57EF14AB9ECA6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_49CCCF0B2A1A5741317C7EF14AB91272" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_61C654F7F647A1C559B57EF14AB9ECA6" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_CreditAgreementasAmendedMember" xlink:label="loc_atvi_CreditAgreementasAmendedMember_3001388543A9853421D67EF14AB91152" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_61C654F7F647A1C559B57EF14AB9ECA6" xlink:to="loc_atvi_CreditAgreementasAmendedMember_3001388543A9853421D67EF14AB91152" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_8DF762D5DFFA620144A27EF14ABA73D6" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_2C53AC38F2800B90698E7EF14AB93CB8" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_8DF762D5DFFA620144A27EF14ABA73D6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_FAAFE96A4004D2F441E27EF14ABA8DC7_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_8DF762D5DFFA620144A27EF14ABA73D6" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_FAAFE96A4004D2F441E27EF14ABA8DC7_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_FAAFE96A4004D2F441E27EF14ABA8DC7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_8DF762D5DFFA620144A27EF14ABA73D6" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_FAAFE96A4004D2F441E27EF14ABA8DC7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_us-gaap_SubsequentEventMember_C6DEE24FE25FB98E9D727EF14ABA7A8F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_FAAFE96A4004D2F441E27EF14ABA8DC7" xlink:to="loc_us-gaap_SubsequentEventMember_C6DEE24FE25FB98E9D727EF14ABA7A8F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_298AAC467A176DD11BF37EF14ABA2A64" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_2C53AC38F2800B90698E7EF14AB93CB8" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_298AAC467A176DD11BF37EF14ABA2A64" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_E0893BBED95EADFBD1037EF14ABAD737_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_298AAC467A176DD11BF37EF14ABA2A64" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_E0893BBED95EADFBD1037EF14ABAD737_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_E0893BBED95EADFBD1037EF14ABAD737" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_298AAC467A176DD11BF37EF14ABA2A64" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_E0893BBED95EADFBD1037EF14ABAD737" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_MarketingCommitmentsMember" xlink:label="loc_atvi_MarketingCommitmentsMember_BA7F795B36CACFDCEDFF7EF14ABB4520" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_E0893BBED95EADFBD1037EF14ABAD737" xlink:to="loc_atvi_MarketingCommitmentsMember_BA7F795B36CACFDCEDFF7EF14ABB4520" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_DeveloperandHostingMember" xlink:label="loc_atvi_DeveloperandHostingMember_EA724AF18700086761617EF14ABBCC4A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_E0893BBED95EADFBD1037EF14ABAD737" xlink:to="loc_atvi_DeveloperandHostingMember_EA724AF18700086761617EF14ABBCC4A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_5EC290E81DAA473CE4247EF14ABB5B7D" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_2C53AC38F2800B90698E7EF14AB93CB8" xlink:to="loc_srt_RangeAxis_5EC290E81DAA473CE4247EF14ABB5B7D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_26AAB7E4D044246B23557EF14ABB5811_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_5EC290E81DAA473CE4247EF14ABB5B7D" xlink:to="loc_srt_RangeMember_26AAB7E4D044246B23557EF14ABB5811_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_26AAB7E4D044246B23557EF14ABB5811" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_5EC290E81DAA473CE4247EF14ABB5B7D" xlink:to="loc_srt_RangeMember_26AAB7E4D044246B23557EF14ABB5811" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_F8AC0B55B82D4D6497BC7EF14ABC2BAD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_26AAB7E4D044246B23557EF14ABB5811" xlink:to="loc_srt_MinimumMember_F8AC0B55B82D4D6497BC7EF14ABC2BAD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_3672D17F4531758CBA107EF14ABC3E66" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_26AAB7E4D044246B23557EF14ABB5811" xlink:to="loc_srt_MaximumMember_3672D17F4531758CBA107EF14ABC3E66" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxAuthorityAxis" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_8D3070D96BBFC8C8E9037EF14ABC620B" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_2C53AC38F2800B90698E7EF14AB93CB8" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_8D3070D96BBFC8C8E9037EF14ABC620B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_C8916C359553B30CD0BE7EF14ABC238D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_8D3070D96BBFC8C8E9037EF14ABC620B" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_C8916C359553B30CD0BE7EF14ABC238D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_C8916C359553B30CD0BE7EF14ABC238D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_8D3070D96BBFC8C8E9037EF14ABC620B" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_C8916C359553B30CD0BE7EF14ABC238D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MinistryOfTheEconomyFinanceAndIndustryFranceMember" xlink:label="loc_us-gaap_MinistryOfTheEconomyFinanceAndIndustryFranceMember_76D8EE5D91453B8792FD7EF14ABC22C1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_C8916C359553B30CD0BE7EF14ABC238D" xlink:to="loc_us-gaap_MinistryOfTheEconomyFinanceAndIndustryFranceMember_76D8EE5D91453B8792FD7EF14ABC22C1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermPurchaseCommitmentAmount" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentAmount_5BF9BCF9699A2CFB26B07EF14ABD80A4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_3D1ED6FE33190E5A35DD7EF14ABDF101" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentAmount_5BF9BCF9699A2CFB26B07EF14ABD80A4" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_LongtermPurchaseCommitmentPercentage" xlink:label="loc_atvi_LongtermPurchaseCommitmentPercentage_DADB75E5174D1A1734767EF14ABDF509" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_3D1ED6FE33190E5A35DD7EF14ABDF101" xlink:to="loc_atvi_LongtermPurchaseCommitmentPercentage_DADB75E5174D1A1734767EF14ABDF509" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermPurchaseCommitmentPeriod" xlink:label="loc_us-gaap_LongtermPurchaseCommitmentPeriod_D860097F436F248E0CF37EF14ABD1171" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_3D1ED6FE33190E5A35DD7EF14ABDF101" xlink:to="loc_us-gaap_LongtermPurchaseCommitmentPeriod_D860097F436F248E0CF37EF14ABD1171" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_IncomeTaxExaminationTotalAssessmentPenaltiesAndInterest" xlink:label="loc_atvi_IncomeTaxExaminationTotalAssessmentPenaltiesAndInterest_F16214CBDDECD13DC75B7EF14ABD2D67" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_3D1ED6FE33190E5A35DD7EF14ABDF101" xlink:to="loc_atvi_IncomeTaxExaminationTotalAssessmentPenaltiesAndInterest_F16214CBDDECD13DC75B7EF14ABD2D67" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions" xlink:label="loc_us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions_FB346396D21451D209347EF14ABD9226" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_3D1ED6FE33190E5A35DD7EF14ABDF101" xlink:to="loc_us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions_FB346396D21451D209347EF14ABD9226" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_IncomeTaxExaminationTaxPaymentIncludingPenaltiesandInterest" xlink:label="loc_atvi_IncomeTaxExaminationTaxPaymentIncludingPenaltiesandInterest_A60B4B5C5602B108F6877EF14ABE8BA4" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_3D1ED6FE33190E5A35DD7EF14ABDF101" xlink:to="loc_atvi_IncomeTaxExaminationTaxPaymentIncludingPenaltiesandInterest_A60B4B5C5602B108F6877EF14ABE8BA4" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_AvailabilityForLettersOfCredit" xlink:label="loc_atvi_AvailabilityForLettersOfCredit_FA4B59CAE7BF2ADDC2327EF14ABEA073" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_3D1ED6FE33190E5A35DD7EF14ABDF101" xlink:to="loc_atvi_AvailabilityForLettersOfCredit_FA4B59CAE7BF2ADDC2327EF14ABEA073" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/CommitmentsAndContingenciesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/ComputationOfBasicDilutedEarningsPerCommonShare" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/ComputationOfBasicDilutedEarningsPerCommonShareDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/ComputationOfBasicDilutedEarningsPerCommonShareTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/ComputationOfBasicDilutedEarningsPerCommonShareWeightedAverageSharesExcludedFromComputationOfDilutedEarningsPerShareDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_15BD105B08B2A80CAA39A4A828C1A1B9" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_E5E2035F0227A2563717A4A828B1D5EA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_15BD105B08B2A80CAA39A4A828C1A1B9" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_E5E2035F0227A2563717A4A828B1D5EA" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_DF6502CD5D323166E298A4A828B12C69" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_E5E2035F0227A2563717A4A828B1D5EA" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_DF6502CD5D323166E298A4A828B12C69" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_54D93BC54A231C4FF948A4A828B1C045_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_DF6502CD5D323166E298A4A828B12C69" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_54D93BC54A231C4FF948A4A828B1C045_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_54D93BC54A231C4FF948A4A828B1C045" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_DF6502CD5D323166E298A4A828B12C69" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_54D93BC54A231C4FF948A4A828B1C045" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockOptionMember" xlink:label="loc_us-gaap_StockOptionMember_FE05B0DE07E2EC360BF2A4A828C136AD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_54D93BC54A231C4FF948A4A828B1C045" xlink:to="loc_us-gaap_StockOptionMember_FE05B0DE07E2EC360BF2A4A828C136AD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_DD5BA11609776746E5E0A4A828C154B4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_15BD105B08B2A80CAA39A4A828C1A1B9" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_DD5BA11609776746E5E0A4A828C154B4" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/ConsolidatedBalanceSheets" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/ConsolidatedStatementsOfCashFlows" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/ConsolidatedStatementsOfChangesInShareholdersEquity" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_14F50B6DDED39FF5D181A266685BAFD6" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_CD719A4019846DFD4B3FA26668594BAB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_14F50B6DDED39FF5D181A266685BAFD6" xlink:to="loc_us-gaap_StatementTable_CD719A4019846DFD4B3FA26668594BAB" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_6F96E75DAC12C3DD649FA26668597CC6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_CD719A4019846DFD4B3FA26668594BAB" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_6F96E75DAC12C3DD649FA26668597CC6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_B2ED5E84DF6B7C8691E8A2666859240B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_6F96E75DAC12C3DD649FA26668597CC6" xlink:to="loc_us-gaap_EquityComponentDomain_B2ED5E84DF6B7C8691E8A2666859240B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_B2ED5E84DF6B7C8691E8A2666859240B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_6F96E75DAC12C3DD649FA26668597CC6" xlink:to="loc_us-gaap_EquityComponentDomain_B2ED5E84DF6B7C8691E8A2666859240B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_873273DB37FF5285167DA266685ABAAE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_B2ED5E84DF6B7C8691E8A2666859240B" xlink:to="loc_us-gaap_CommonStockMember_873273DB37FF5285167DA266685ABAAE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TreasuryStockMember" xlink:label="loc_us-gaap_TreasuryStockMember_EB073E4B10BE0101705EA266685A6ADB" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_B2ED5E84DF6B7C8691E8A2666859240B" xlink:to="loc_us-gaap_TreasuryStockMember_EB073E4B10BE0101705EA266685A6ADB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_FCA0BF7E55F7D7877B44A266685A2675" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_B2ED5E84DF6B7C8691E8A2666859240B" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_FCA0BF7E55F7D7877B44A266685A2675" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_us-gaap_RetainedEarningsMember_C7AD3E6B60C817D46D17A266685A5DE5" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_B2ED5E84DF6B7C8691E8A2666859240B" xlink:to="loc_us-gaap_RetainedEarningsMember_C7AD3E6B60C817D46D17A266685A5DE5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_3605B8E1AAB2CFBC3C89A266685ABB06" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_B2ED5E84DF6B7C8691E8A2666859240B" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_3605B8E1AAB2CFBC3C89A266685ABB06" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_7EFF3F1A2BBB2A094DE7A266685B4D4D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_CD719A4019846DFD4B3FA26668594BAB" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_7EFF3F1A2BBB2A094DE7A266685B4D4D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_9B99C0ACC669FEB6320AA266685BAA85_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_7EFF3F1A2BBB2A094DE7A266685B4D4D" xlink:to="loc_us-gaap_TypeOfAdoptionMember_9B99C0ACC669FEB6320AA266685BAA85_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_9B99C0ACC669FEB6320AA266685BAA85" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_7EFF3F1A2BBB2A094DE7A266685B4D4D" xlink:to="loc_us-gaap_TypeOfAdoptionMember_9B99C0ACC669FEB6320AA266685BAA85" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountingStandardsUpdate201409Member" xlink:label="loc_us-gaap_AccountingStandardsUpdate201409Member_21294BA1E4B450C1B991A266685BF70A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfAdoptionMember_9B99C0ACC669FEB6320AA266685BAA85" xlink:to="loc_us-gaap_AccountingStandardsUpdate201409Member_21294BA1E4B450C1B991A266685BF70A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_6FB6B54D45A5ED1C6B62A266685B8572" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_14F50B6DDED39FF5D181A266685BAFD6" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_6FB6B54D45A5ED1C6B62A266685B8572" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_88B5F5D31508F700CA8BA266685CC12C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_6FB6B54D45A5ED1C6B62A266685B8572" xlink:to="loc_us-gaap_StockholdersEquity_88B5F5D31508F700CA8BA266685CC12C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharesIssued" xlink:label="loc_us-gaap_SharesIssued_5A534422DFB6217A2FE0A266685C05B3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_6FB6B54D45A5ED1C6B62A266685B8572" xlink:to="loc_us-gaap_SharesIssued_5A534422DFB6217A2FE0A266685C05B3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAbstract" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_5F700AD0223834494FAEA266685CF3DE" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_6FB6B54D45A5ED1C6B62A266685B8572" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_5F700AD0223834494FAEA266685CF3DE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption" xlink:label="loc_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_576C9041693DC9118DF2A266685CF4FA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_5F700AD0223834494FAEA266685CF3DE" xlink:to="loc_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_576C9041693DC9118DF2A266685CF4FA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_D38B3DE882EEE9095E0DA266685C56C4" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_5F700AD0223834494FAEA266685CF3DE" xlink:to="loc_us-gaap_NetIncomeLoss_D38B3DE882EEE9095E0DA266685C56C4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_1E5A492A0C4B6962BF1DA266685DD5BB" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_5F700AD0223834494FAEA266685CF3DE" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_1E5A492A0C4B6962BF1DA266685DD5BB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross_5BF6F3F2DB4880A8A330A266685D36CD" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_6FB6B54D45A5ED1C6B62A266685B8572" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross_5BF6F3F2DB4880A8A330A266685D36CD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross_11DFC7EADC1C056A2F65A266685DAA7C" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_6FB6B54D45A5ED1C6B62A266685B8572" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross_11DFC7EADC1C056A2F65A266685DAA7C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross_D8862BB1D3E1193D267AA266685D1E00" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_6FB6B54D45A5ED1C6B62A266685B8572" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross_D8862BB1D3E1193D267AA266685D1E00" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross_41137D1873B9CD5274EAA266685D90E4" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_6FB6B54D45A5ED1C6B62A266685B8572" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross_41137D1873B9CD5274EAA266685D90E4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_814306D5EB80C03EAD53A266685E9F91" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_6FB6B54D45A5ED1C6B62A266685B8572" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_814306D5EB80C03EAD53A266685E9F91" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation" xlink:label="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_2C33FDB90620DD8CA35FA266685E2EB0" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_6FB6B54D45A5ED1C6B62A266685B8572" xlink:to="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_2C33FDB90620DD8CA35FA266685E2EB0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_E3CDBAEDC0D2046A491FA266685E951E" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_6FB6B54D45A5ED1C6B62A266685B8572" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_E3CDBAEDC0D2046A491FA266685E951E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DividendsCommonStockCash" xlink:label="loc_us-gaap_DividendsCommonStockCash_B1775C35E1CB0190CE3CA266685E87B0" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_6FB6B54D45A5ED1C6B62A266685B8572" xlink:to="loc_us-gaap_DividendsCommonStockCash_B1775C35E1CB0190CE3CA266685E87B0" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/ConsolidatedStatementsOfChangesInShareholdersEquityParenthetical" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/ConsolidatedStatementsOfComprehensiveIncome" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/ConsolidatedStatementsOfOperations" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_F5914C79ABD470284667512A5B4441FE" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_405AFD1F3295A8B33CFD512A5B4189D2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_F5914C79ABD470284667512A5B4441FE" xlink:to="loc_us-gaap_StatementTable_405AFD1F3295A8B33CFD512A5B4189D2" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ProductOrServiceAxis" xlink:label="loc_srt_ProductOrServiceAxis_99EA829AB1B8D593EE74512A5B417C57" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_405AFD1F3295A8B33CFD512A5B4189D2" xlink:to="loc_srt_ProductOrServiceAxis_99EA829AB1B8D593EE74512A5B417C57" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_E407A593FB7378252F13512A5B42E64F_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_99EA829AB1B8D593EE74512A5B417C57" xlink:to="loc_srt_ProductsAndServicesDomain_E407A593FB7378252F13512A5B42E64F_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_E407A593FB7378252F13512A5B42E64F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_99EA829AB1B8D593EE74512A5B417C57" xlink:to="loc_srt_ProductsAndServicesDomain_E407A593FB7378252F13512A5B42E64F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProductMember" xlink:label="loc_us-gaap_ProductMember_ED806887365FCDB5C1B4512A5B427A09" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_E407A593FB7378252F13512A5B42E64F" xlink:to="loc_us-gaap_ProductMember_ED806887365FCDB5C1B4512A5B427A09" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_ProductSalesProductCostsMember" xlink:label="loc_atvi_ProductSalesProductCostsMember_2E46DB7666BF87D2E9F7512A5B42ABCF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductMember_ED806887365FCDB5C1B4512A5B427A09" xlink:to="loc_atvi_ProductSalesProductCostsMember_2E46DB7666BF87D2E9F7512A5B42ABCF" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_ProductSalesSoftwareRoyaltiesAmortizationandIntellectualPropertyLicensesMember" xlink:label="loc_atvi_ProductSalesSoftwareRoyaltiesAmortizationandIntellectualPropertyLicensesMember_2A64DF7A8CDED244BE57512A5B43B157" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductMember_ED806887365FCDB5C1B4512A5B427A09" xlink:to="loc_atvi_ProductSalesSoftwareRoyaltiesAmortizationandIntellectualPropertyLicensesMember_2A64DF7A8CDED244BE57512A5B43B157" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_SubscriptionLicensingandOtherMember" xlink:label="loc_atvi_SubscriptionLicensingandOtherMember_A2C69314250F65D9545B512A5B43763E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_E407A593FB7378252F13512A5B42E64F" xlink:to="loc_atvi_SubscriptionLicensingandOtherMember_A2C69314250F65D9545B512A5B43763E" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_SubscriptionLicensingandOtherGameOperationsandDistributionMember" xlink:label="loc_atvi_SubscriptionLicensingandOtherGameOperationsandDistributionMember_D7D276C4F81F74C5C0AC512A5B433A7C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_SubscriptionLicensingandOtherMember_A2C69314250F65D9545B512A5B43763E" xlink:to="loc_atvi_SubscriptionLicensingandOtherGameOperationsandDistributionMember_D7D276C4F81F74C5C0AC512A5B433A7C" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_SubscriptionLicensingandOtherSoftwareRoyaltiesAmortizationandIntellectualPropertyLicensesMember" xlink:label="loc_atvi_SubscriptionLicensingandOtherSoftwareRoyaltiesAmortizationandIntellectualPropertyLicensesMember_BB94C47C2BB42939666D512A5B438A0B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_SubscriptionLicensingandOtherMember_A2C69314250F65D9545B512A5B43763E" xlink:to="loc_atvi_SubscriptionLicensingandOtherSoftwareRoyaltiesAmortizationandIntellectualPropertyLicensesMember_BB94C47C2BB42939666D512A5B438A0B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenuesAbstract" xlink:label="loc_us-gaap_RevenuesAbstract_71630B6B34C7E4B8F89F512A5B443EFF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_F5914C79ABD470284667512A5B4441FE" xlink:to="loc_us-gaap_RevenuesAbstract_71630B6B34C7E4B8F89F512A5B443EFF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_3A8730C59AAF3D1049AA512A5B448B7F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_71630B6B34C7E4B8F89F512A5B443EFF" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_3A8730C59AAF3D1049AA512A5B448B7F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="loc_us-gaap_CostsAndExpensesAbstract_2D19BCAC241DE22FE3F5512A5B442A00" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_F5914C79ABD470284667512A5B4441FE" xlink:to="loc_us-gaap_CostsAndExpensesAbstract_2D19BCAC241DE22FE3F5512A5B442A00" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostOfRevenueAbstract" xlink:label="loc_us-gaap_CostOfRevenueAbstract_ADB131C4C1FE5EBEA45F512A5B442D4F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_2D19BCAC241DE22FE3F5512A5B442A00" xlink:to="loc_us-gaap_CostOfRevenueAbstract_ADB131C4C1FE5EBEA45F512A5B442D4F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostOfRevenue" xlink:label="loc_us-gaap_CostOfRevenue_15DCF15A5A518022B7C5512A5B45724F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfRevenueAbstract_ADB131C4C1FE5EBEA45F512A5B442D4F" xlink:to="loc_us-gaap_CostOfRevenue_15DCF15A5A518022B7C5512A5B45724F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_509FC017BDBC4D6BDB8B512A5B451446" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_2D19BCAC241DE22FE3F5512A5B442A00" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_509FC017BDBC4D6BDB8B512A5B451446" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SellingAndMarketingExpense" xlink:label="loc_us-gaap_SellingAndMarketingExpense_E292CA38406115325061512A5B4540EC" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_2D19BCAC241DE22FE3F5512A5B442A00" xlink:to="loc_us-gaap_SellingAndMarketingExpense_E292CA38406115325061512A5B4540EC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_C27B76411C3CE5F91C1C512A5B45ABC4" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_2D19BCAC241DE22FE3F5512A5B442A00" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_C27B76411C3CE5F91C1C512A5B45ABC4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringCharges" xlink:label="loc_us-gaap_RestructuringCharges_045CBCE04D6011544302512A5B46D8BD" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_2D19BCAC241DE22FE3F5512A5B442A00" xlink:to="loc_us-gaap_RestructuringCharges_045CBCE04D6011544302512A5B46D8BD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostsAndExpenses" xlink:label="loc_us-gaap_CostsAndExpenses_52D96A000184087A9303512A5B465EA8" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_2D19BCAC241DE22FE3F5512A5B442A00" xlink:to="loc_us-gaap_CostsAndExpenses_52D96A000184087A9303512A5B465EA8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_403EF477317584342108512A5B461324" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_F5914C79ABD470284667512A5B4441FE" xlink:to="loc_us-gaap_OperatingIncomeLoss_403EF477317584342108512A5B461324" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_6907599BBB6712998DE4512A5B460EAD" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_F5914C79ABD470284667512A5B4441FE" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_6907599BBB6712998DE4512A5B460EAD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_672F131EB58651F1829F512A5B4617AA" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_F5914C79ABD470284667512A5B4441FE" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_672F131EB58651F1829F512A5B4617AA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_E9766E9D4DDB0801588A512A5B4768CA" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_F5914C79ABD470284667512A5B4441FE" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_E9766E9D4DDB0801588A512A5B4768CA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_F72ABF23FFD36C3FBE65512A5B473190" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_F5914C79ABD470284667512A5B4441FE" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_F72ABF23FFD36C3FBE65512A5B473190" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_18A65512D0528D720EF7512A5B47657D" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_F5914C79ABD470284667512A5B4441FE" xlink:to="loc_us-gaap_NetIncomeLoss_18A65512D0528D720EF7512A5B47657D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareAbstract" xlink:label="loc_us-gaap_EarningsPerShareAbstract_1AED924475E669DB1B6C512A5B4C4D9B" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_F5914C79ABD470284667512A5B4441FE" xlink:to="loc_us-gaap_EarningsPerShareAbstract_1AED924475E669DB1B6C512A5B4C4D9B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="loc_us-gaap_EarningsPerShareBasic_971EAF2934F81E58C696512A5B4CE717" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_1AED924475E669DB1B6C512A5B4C4D9B" xlink:to="loc_us-gaap_EarningsPerShareBasic_971EAF2934F81E58C696512A5B4CE717" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_us-gaap_EarningsPerShareDiluted_A08888E3B39B028C0F47512A5B4D6541" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_1AED924475E669DB1B6C512A5B4C4D9B" xlink:to="loc_us-gaap_EarningsPerShareDiluted_A08888E3B39B028C0F47512A5B4D6541" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_D2A9DF66CDDFF814C79A512A5B4DE816" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_F5914C79ABD470284667512A5B4441FE" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_D2A9DF66CDDFF814C79A512A5B4DE816" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_8E0D923E1E3989CEA1CB512A5B4DF2DF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_D2A9DF66CDDFF814C79A512A5B4DE816" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_8E0D923E1E3989CEA1CB512A5B4DF2DF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_3085C042DDB13E46F98E512A5B4E7139" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_D2A9DF66CDDFF814C79A512A5B4DE816" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_3085C042DDB13E46F98E512A5B4E7139" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/CoverPage" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/Debt" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/DebtCreditFacilitiesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_D4850A35A531308FBD637934FFB35AD5" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_A64ABC230C57FAF94ED17934FFAF8A42" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_D4850A35A531308FBD637934FFB35AD5" xlink:to="loc_us-gaap_DebtInstrumentTable_A64ABC230C57FAF94ED17934FFAF8A42" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CreditFacilityAxis" xlink:label="loc_us-gaap_CreditFacilityAxis_6CDB69655EFAFF715B627934FFAF5B28" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_A64ABC230C57FAF94ED17934FFAF8A42" xlink:to="loc_us-gaap_CreditFacilityAxis_6CDB69655EFAFF715B627934FFAF5B28" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_3AF3B97712CC525A62C37934FFAFBE0D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_6CDB69655EFAFF715B627934FFAF5B28" xlink:to="loc_us-gaap_CreditFacilityDomain_3AF3B97712CC525A62C37934FFAFBE0D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_3AF3B97712CC525A62C37934FFAFBE0D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_6CDB69655EFAFF715B627934FFAF5B28" xlink:to="loc_us-gaap_CreditFacilityDomain_3AF3B97712CC525A62C37934FFAFBE0D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_98102F9B389E5E37748B7934FFB0BBC2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_3AF3B97712CC525A62C37934FFAFBE0D" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_98102F9B389E5E37748B7934FFB0BBC2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_F3B0840496848C65609A7934FFB0F2DC" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_A64ABC230C57FAF94ED17934FFAF8A42" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_F3B0840496848C65609A7934FFB0F2DC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_A67E156DEDC07E3325D87934FFB0D96A_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_F3B0840496848C65609A7934FFB0F2DC" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_A67E156DEDC07E3325D87934FFB0D96A_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_A67E156DEDC07E3325D87934FFB0D96A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_F3B0840496848C65609A7934FFB0F2DC" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_A67E156DEDC07E3325D87934FFB0D96A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditMember" xlink:label="loc_us-gaap_LineOfCreditMember_DF4911969252464472997934FFB0AAE4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_A67E156DEDC07E3325D87934FFB0D96A" xlink:to="loc_us-gaap_LineOfCreditMember_DF4911969252464472997934FFB0AAE4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_52AE4CA8CB5EC13D40FC7934FFB197F4" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_A64ABC230C57FAF94ED17934FFAF8A42" xlink:to="loc_us-gaap_DebtInstrumentAxis_52AE4CA8CB5EC13D40FC7934FFB197F4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_206EB554B81BBE256B9A7934FFB18FF1_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_52AE4CA8CB5EC13D40FC7934FFB197F4" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_206EB554B81BBE256B9A7934FFB18FF1_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_206EB554B81BBE256B9A7934FFB18FF1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_52AE4CA8CB5EC13D40FC7934FFB197F4" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_206EB554B81BBE256B9A7934FFB18FF1" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_CreditAgreementasAmendedMember" xlink:label="loc_atvi_CreditAgreementasAmendedMember_9F405113B274269238D97934FFB1BFE0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_206EB554B81BBE256B9A7934FFB18FF1" xlink:to="loc_atvi_CreditAgreementasAmendedMember_9F405113B274269238D97934FFB1BFE0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_VariableRateAxis" xlink:label="loc_us-gaap_VariableRateAxis_060A41E0FB6E622093D27934FFB11D8E" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_A64ABC230C57FAF94ED17934FFAF8A42" xlink:to="loc_us-gaap_VariableRateAxis_060A41E0FB6E622093D27934FFB11D8E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_AE5C82C1271A90D7D6627934FFB18A38_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_060A41E0FB6E622093D27934FFB11D8E" xlink:to="loc_us-gaap_VariableRateDomain_AE5C82C1271A90D7D6627934FFB18A38_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_AE5C82C1271A90D7D6627934FFB18A38" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_060A41E0FB6E622093D27934FFB11D8E" xlink:to="loc_us-gaap_VariableRateDomain_AE5C82C1271A90D7D6627934FFB18A38" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FederalFundsEffectiveSwapRateMember" xlink:label="loc_us-gaap_FederalFundsEffectiveSwapRateMember_59B2A26C00E56B6A795C7934FFB21B73" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_AE5C82C1271A90D7D6627934FFB18A38" xlink:to="loc_us-gaap_FederalFundsEffectiveSwapRateMember_59B2A26C00E56B6A795C7934FFB21B73" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LondonInterbankOfferedRateLIBORMember" xlink:label="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_DF9DCA8FCAC2AF90BB127934FFB27E18" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_AE5C82C1271A90D7D6627934FFB18A38" xlink:to="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_DF9DCA8FCAC2AF90BB127934FFB27E18" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BaseRateMember" xlink:label="loc_us-gaap_BaseRateMember_3E0BD2F090B4588417A87934FFB27121" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_AE5C82C1271A90D7D6627934FFB18A38" xlink:to="loc_us-gaap_BaseRateMember_3E0BD2F090B4588417A87934FFB27121" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_A4E9FB84BB0C198D25587934FFB200A6" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_A64ABC230C57FAF94ED17934FFAF8A42" xlink:to="loc_srt_RangeAxis_A4E9FB84BB0C198D25587934FFB200A6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_2CC42359AC47600BC1AC7934FFB2057F_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_A4E9FB84BB0C198D25587934FFB200A6" xlink:to="loc_srt_RangeMember_2CC42359AC47600BC1AC7934FFB2057F_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_2CC42359AC47600BC1AC7934FFB2057F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_A4E9FB84BB0C198D25587934FFB200A6" xlink:to="loc_srt_RangeMember_2CC42359AC47600BC1AC7934FFB2057F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_DAC8FC6B93A06FA5369A7934FFB31BA0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_2CC42359AC47600BC1AC7934FFB2057F" xlink:to="loc_srt_MinimumMember_DAC8FC6B93A06FA5369A7934FFB31BA0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_87A2E23F9594B253B4647934FFB35DB6" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_2CC42359AC47600BC1AC7934FFB2057F" xlink:to="loc_srt_MaximumMember_87A2E23F9594B253B4647934FFB35DB6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_B1C24572E30899FAFA0F7934FFB34B6A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_D4850A35A531308FBD637934FFB35AD5" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_B1C24572E30899FAFA0F7934FFB34B6A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCredit" xlink:label="loc_us-gaap_LineOfCredit_C893D746E75A19AA41FF7934FFB397E3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_D4850A35A531308FBD637934FFB35AD5" xlink:to="loc_us-gaap_LineOfCredit_C893D746E75A19AA41FF7934FFB397E3" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_DebtInstrumentBaseRateMargin" xlink:label="loc_atvi_DebtInstrumentBaseRateMargin_E5DBF449DE2728A4856A7934FFB45E7E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_D4850A35A531308FBD637934FFB35AD5" xlink:to="loc_atvi_DebtInstrumentBaseRateMargin_E5DBF449DE2728A4856A7934FFB45E7E" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_DebtInstrumentVariableRateInterestFloor" xlink:label="loc_atvi_DebtInstrumentVariableRateInterestFloor_62354364E7E1E051B1167934FFB460EC" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_D4850A35A531308FBD637934FFB35AD5" xlink:to="loc_atvi_DebtInstrumentVariableRateInterestFloor_62354364E7E1E051B1167934FFB460EC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_B14018DD9D852DFD52977934FFB469C9" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_D4850A35A531308FBD637934FFB35AD5" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_B14018DD9D852DFD52977934FFB469C9" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_AvailabilityForLettersOfCredit" xlink:label="loc_atvi_AvailabilityForLettersOfCredit_8D8183593F02A1FD06907934FFB45420" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_D4850A35A531308FBD637934FFB35AD5" xlink:to="loc_atvi_AvailabilityForLettersOfCredit_8D8183593F02A1FD06907934FFB45420" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_DebtInstrumentCovenantConsolidatedTotalNetDebtRatioMaximum" xlink:label="loc_atvi_DebtInstrumentCovenantConsolidatedTotalNetDebtRatioMaximum_848BBABB76D6E88ECCC17934FFB4807A" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_D4850A35A531308FBD637934FFB35AD5" xlink:to="loc_atvi_DebtInstrumentCovenantConsolidatedTotalNetDebtRatioMaximum_848BBABB76D6E88ECCC17934FFB4807A" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_DebtInstrumentCovenantConsolidatedTotalNetDebtRatioQualifyingAcquisition" xlink:label="loc_atvi_DebtInstrumentCovenantConsolidatedTotalNetDebtRatioQualifyingAcquisition_E9E47F3803D9BA45FC407934FFB59978" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_D4850A35A531308FBD637934FFB35AD5" xlink:to="loc_atvi_DebtInstrumentCovenantConsolidatedTotalNetDebtRatioQualifyingAcquisition_E9E47F3803D9BA45FC407934FFB59978" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_DebtInstrumentCovenantConsolidatedTotalAssetsRatioMaximum" xlink:label="loc_atvi_DebtInstrumentCovenantConsolidatedTotalAssetsRatioMaximum_EE90CFC2B96A04C994747934FFB57977" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_D4850A35A531308FBD637934FFB35AD5" xlink:to="loc_atvi_DebtInstrumentCovenantConsolidatedTotalAssetsRatioMaximum_EE90CFC2B96A04C994747934FFB57977" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/DebtDebtFairValueDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_2B2FA32D0E802FE95EF5597E26B6ACC4" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_93BFB4A5DC095DCF2F21597E26B2750B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2B2FA32D0E802FE95EF5597E26B6ACC4" xlink:to="loc_us-gaap_DebtInstrumentTable_93BFB4A5DC095DCF2F21597E26B2750B" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_3FC4245153E046582180597E26B3110F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_93BFB4A5DC095DCF2F21597E26B2750B" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_3FC4245153E046582180597E26B3110F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_BDA87CFC0254A8563D8D597E26B3BF83_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_3FC4245153E046582180597E26B3110F" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_BDA87CFC0254A8563D8D597E26B3BF83_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_BDA87CFC0254A8563D8D597E26B3BF83" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_3FC4245153E046582180597E26B3110F" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_BDA87CFC0254A8563D8D597E26B3BF83" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditMember" xlink:label="loc_us-gaap_LineOfCreditMember_12F2BF308A17E5FF47B9597E26B4370B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_BDA87CFC0254A8563D8D597E26B3BF83" xlink:to="loc_us-gaap_LineOfCreditMember_12F2BF308A17E5FF47B9597E26B4370B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnsecuredDebtMember" xlink:label="loc_us-gaap_UnsecuredDebtMember_1B4424937595E6E5AB00597E26B41181" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_BDA87CFC0254A8563D8D597E26B3BF83" xlink:to="loc_us-gaap_UnsecuredDebtMember_1B4424937595E6E5AB00597E26B41181" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_F145F0DC197C6E3500A8597E26B4D2C0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_93BFB4A5DC095DCF2F21597E26B2750B" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_F145F0DC197C6E3500A8597E26B4D2C0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_A71EDF5277D3D9564723597E26B4EC6D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_F145F0DC197C6E3500A8597E26B4D2C0" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_A71EDF5277D3D9564723597E26B4EC6D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_A71EDF5277D3D9564723597E26B4EC6D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_F145F0DC197C6E3500A8597E26B4D2C0" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_A71EDF5277D3D9564723597E26B4EC6D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_8425F126F45BF1FED9C7597E26B5B1D7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_A71EDF5277D3D9564723597E26B4EC6D" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_8425F126F45BF1FED9C7597E26B5B1D7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_F202B085EA945F50AE85597E26B511C3" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_93BFB4A5DC095DCF2F21597E26B2750B" xlink:to="loc_us-gaap_DebtInstrumentAxis_F202B085EA945F50AE85597E26B511C3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_B97E287E1E28CEE052CC597E26B557C8_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_F202B085EA945F50AE85597E26B511C3" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_B97E287E1E28CEE052CC597E26B557C8_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_B97E287E1E28CEE052CC597E26B557C8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_F202B085EA945F50AE85597E26B511C3" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_B97E287E1E28CEE052CC597E26B557C8" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_Unsecured2026NotesMember" xlink:label="loc_atvi_Unsecured2026NotesMember_FE3E45BCC644FC27CDF3597E26B6CBFB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_B97E287E1E28CEE052CC597E26B557C8" xlink:to="loc_atvi_Unsecured2026NotesMember_FE3E45BCC644FC27CDF3597E26B6CBFB" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_Unsecured2027NotesMember" xlink:label="loc_atvi_Unsecured2027NotesMember_24BC2FCA7C65C212FF72597E26B6F3E4" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_B97E287E1E28CEE052CC597E26B557C8" xlink:to="loc_atvi_Unsecured2027NotesMember_24BC2FCA7C65C212FF72597E26B6F3E4" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_Unsecured2047NotesMember" xlink:label="loc_atvi_Unsecured2047NotesMember_E02D29E5217CCD24F0F4597E26B6FD5C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_B97E287E1E28CEE052CC597E26B557C8" xlink:to="loc_atvi_Unsecured2047NotesMember_E02D29E5217CCD24F0F4597E26B6FD5C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtFairValue" xlink:label="loc_us-gaap_LongTermDebtFairValue_B51D99812292FEA62738597E26B7EA94" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2B2FA32D0E802FE95EF5597E26B6ACC4" xlink:to="loc_us-gaap_LongTermDebtFairValue_B51D99812292FEA62738597E26B7EA94" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/DebtScheduleOfMaturitiesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/DebtSummaryOfDebtDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_3BFB20A3F18C1A59A912A4D59545D537" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_215B47D35D9AABA86313A4D595423477" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3BFB20A3F18C1A59A912A4D59545D537" xlink:to="loc_us-gaap_DebtInstrumentTable_215B47D35D9AABA86313A4D595423477" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_BD4D11F97776B3FAE477A4D59543983A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_215B47D35D9AABA86313A4D595423477" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_BD4D11F97776B3FAE477A4D59543983A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_5974E442177D4DAC0809A4D595439A21_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_BD4D11F97776B3FAE477A4D59543983A" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_5974E442177D4DAC0809A4D595439A21_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_5974E442177D4DAC0809A4D595439A21" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_BD4D11F97776B3FAE477A4D59543983A" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_5974E442177D4DAC0809A4D595439A21" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnsecuredDebtMember" xlink:label="loc_us-gaap_UnsecuredDebtMember_9BD9DBACB0749EA56442A4D595433A4C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_5974E442177D4DAC0809A4D595439A21" xlink:to="loc_us-gaap_UnsecuredDebtMember_9BD9DBACB0749EA56442A4D595433A4C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_3131C8315ED2A014C22EA4D595445D80" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_215B47D35D9AABA86313A4D595423477" xlink:to="loc_us-gaap_DebtInstrumentAxis_3131C8315ED2A014C22EA4D595445D80" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_DC30855D9A234BC5F5B9A4D59544C6A8_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_3131C8315ED2A014C22EA4D595445D80" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_DC30855D9A234BC5F5B9A4D59544C6A8_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_DC30855D9A234BC5F5B9A4D59544C6A8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_3131C8315ED2A014C22EA4D595445D80" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_DC30855D9A234BC5F5B9A4D59544C6A8" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_Unsecured2021NotesMember" xlink:label="loc_atvi_Unsecured2021NotesMember_0B74FB4BA1412AA645C0A4D59544E621" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_DC30855D9A234BC5F5B9A4D59544C6A8" xlink:to="loc_atvi_Unsecured2021NotesMember_0B74FB4BA1412AA645C0A4D59544E621" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_Unsecured2022NotesMember" xlink:label="loc_atvi_Unsecured2022NotesMember_4B4A22C14CF18712A239A4D595441C69" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_DC30855D9A234BC5F5B9A4D59544C6A8" xlink:to="loc_atvi_Unsecured2022NotesMember_4B4A22C14CF18712A239A4D595441C69" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_Unsecured2026NotesMember" xlink:label="loc_atvi_Unsecured2026NotesMember_382A663419A99B09476FA4D595457013" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_DC30855D9A234BC5F5B9A4D59544C6A8" xlink:to="loc_atvi_Unsecured2026NotesMember_382A663419A99B09476FA4D595457013" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_Unsecured2027NotesMember" xlink:label="loc_atvi_Unsecured2027NotesMember_FE3FBBF0DC57633AC6DFA4D595450278" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_DC30855D9A234BC5F5B9A4D59544C6A8" xlink:to="loc_atvi_Unsecured2027NotesMember_FE3FBBF0DC57633AC6DFA4D595450278" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_Unsecured2047NotesMember" xlink:label="loc_atvi_Unsecured2047NotesMember_413E1CE44E4F99ADEEC2A4D59545B016" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_DC30855D9A234BC5F5B9A4D59544C6A8" xlink:to="loc_atvi_Unsecured2047NotesMember_413E1CE44E4F99ADEEC2A4D59545B016" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentCarryingAmount" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_66FC73F5DB88A123D099A4D595455893" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3BFB20A3F18C1A59A912A4D59545D537" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_66FC73F5DB88A123D099A4D595455893" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_5129BFCA0E70E9D837A3A4D59546B427" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3BFB20A3F18C1A59A912A4D59545D537" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_5129BFCA0E70E9D837A3A4D59546B427" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_991C40E5D48F887A648BA4D5954620CA" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3BFB20A3F18C1A59A912A4D59545D537" xlink:to="loc_us-gaap_LongTermDebt_991C40E5D48F887A648BA4D5954620CA" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/DebtTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/DebtUnsecuredSeniorNotesAndInterestExpenseAndFinancingCostsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_03408EFE9C3D655153857943E617E9F2" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_9B069E8C3DF1994658D17943E6130451" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_03408EFE9C3D655153857943E617E9F2" xlink:to="loc_us-gaap_DebtInstrumentTable_9B069E8C3DF1994658D17943E6130451" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_47358A034C308B96633C7943E615A2CE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_9B069E8C3DF1994658D17943E6130451" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_47358A034C308B96633C7943E615A2CE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_C20ACB59AC1E05024B4F7943E615D12C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_47358A034C308B96633C7943E615A2CE" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_C20ACB59AC1E05024B4F7943E615D12C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_C20ACB59AC1E05024B4F7943E615D12C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_47358A034C308B96633C7943E615A2CE" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_C20ACB59AC1E05024B4F7943E615D12C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnsecuredDebtMember" xlink:label="loc_us-gaap_UnsecuredDebtMember_E434F872080280C698E47943E6156556" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_C20ACB59AC1E05024B4F7943E615D12C" xlink:to="loc_us-gaap_UnsecuredDebtMember_E434F872080280C698E47943E6156556" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_ED78BF0EDD9668DF54167943E6167068" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_9B069E8C3DF1994658D17943E6130451" xlink:to="loc_us-gaap_DebtInstrumentAxis_ED78BF0EDD9668DF54167943E6167068" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_D38AFFB7CC41DCD2D6DB7943E616A390_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_ED78BF0EDD9668DF54167943E6167068" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_D38AFFB7CC41DCD2D6DB7943E616A390_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_D38AFFB7CC41DCD2D6DB7943E616A390" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_ED78BF0EDD9668DF54167943E6167068" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_D38AFFB7CC41DCD2D6DB7943E616A390" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_Unsecured2021NotesMember" xlink:label="loc_atvi_Unsecured2021NotesMember_6D075D45DF14D66826337943E616BC9D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_D38AFFB7CC41DCD2D6DB7943E616A390" xlink:to="loc_atvi_Unsecured2021NotesMember_6D075D45DF14D66826337943E616BC9D" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_Unsecured2022NotesMember" xlink:label="loc_atvi_Unsecured2022NotesMember_CB994057180CDDE5EEC27943E617AE8C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_D38AFFB7CC41DCD2D6DB7943E616A390" xlink:to="loc_atvi_Unsecured2022NotesMember_CB994057180CDDE5EEC27943E617AE8C" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_Unsecured2026NotesMember" xlink:label="loc_atvi_Unsecured2026NotesMember_B2BDFCF19D702ED7E3FF7943E617F68D" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_D38AFFB7CC41DCD2D6DB7943E616A390" xlink:to="loc_atvi_Unsecured2026NotesMember_B2BDFCF19D702ED7E3FF7943E617F68D" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_Unsecured2027NotesMember" xlink:label="loc_atvi_Unsecured2027NotesMember_0BC9290642BD582052B57943E617576F" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_D38AFFB7CC41DCD2D6DB7943E616A390" xlink:to="loc_atvi_Unsecured2027NotesMember_0BC9290642BD582052B57943E617576F" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_Unsecured2047NotesMember" xlink:label="loc_atvi_Unsecured2047NotesMember_5A78212FD9D072E0E5977943E617B273" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_D38AFFB7CC41DCD2D6DB7943E616A390" xlink:to="loc_atvi_Unsecured2047NotesMember_5A78212FD9D072E0E5977943E617B273" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_NotesMember" xlink:label="loc_atvi_NotesMember_11B049DFA0A6310FD8E17943E617D1CC" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_D38AFFB7CC41DCD2D6DB7943E616A390" xlink:to="loc_atvi_NotesMember_11B049DFA0A6310FD8E17943E617D1CC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentCarryingAmount" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_064238C1BA974CBCBB847943E618819F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_03408EFE9C3D655153857943E617E9F2" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_064238C1BA974CBCBB847943E618819F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_E9C307AB99CB422ED4947943E618115F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_03408EFE9C3D655153857943E617E9F2" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_E9C307AB99CB422ED4947943E618115F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestPayableCurrentAndNoncurrent" xlink:label="loc_us-gaap_InterestPayableCurrentAndNoncurrent_010A0BE17933DD69F44D7943E6183C89" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_03408EFE9C3D655153857943E617E9F2" xlink:to="loc_us-gaap_InterestPayableCurrentAndNoncurrent_010A0BE17933DD69F44D7943E6183C89" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_DebtInstrumentRedemptionPricePlusMakeWholePremiumPercentage" xlink:label="loc_atvi_DebtInstrumentRedemptionPricePlusMakeWholePremiumPercentage_0B715D6D0E946C7E44307943E6180009" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_03408EFE9C3D655153857943E617E9F2" xlink:to="loc_atvi_DebtInstrumentRedemptionPricePlusMakeWholePremiumPercentage_0B715D6D0E946C7E44307943E6180009" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_034B0CDDAEF77EE62DE97943E61945EF" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_03408EFE9C3D655153857943E617E9F2" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_034B0CDDAEF77EE62DE97943E61945EF" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_PercentageOfPrincipalRepayableToOptionHoldersUponCertainCriteria" xlink:label="loc_atvi_PercentageOfPrincipalRepayableToOptionHoldersUponCertainCriteria_1F7E8752D0A0E48FFB677943E619E123" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_03408EFE9C3D655153857943E617E9F2" xlink:to="loc_atvi_PercentageOfPrincipalRepayableToOptionHoldersUponCertainCriteria_1F7E8752D0A0E48FFB677943E619E123" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestExpenseDebtExcludingAmortization" xlink:label="loc_us-gaap_InterestExpenseDebtExcludingAmortization_ACEC0B8F52EB5B276E547943E619ED20" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_03408EFE9C3D655153857943E617E9F2" xlink:to="loc_us-gaap_InterestExpenseDebtExcludingAmortization_ACEC0B8F52EB5B276E547943E619ED20" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AmortizationOfFinancingCostsAndDiscounts" xlink:label="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_2F367D2B279A5E722A277943E619EA4B" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_03408EFE9C3D655153857943E617E9F2" xlink:to="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_2F367D2B279A5E722A277943E619EA4B" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/DeferredRevenues" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/DeferredRevenuesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/DeferredRevenuesRemainingPerformanceObligationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_EB75FD6C677FD9E2D158A4A828A263F3" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_477317D9939D1C2A67F3A4A82892A610" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_EB75FD6C677FD9E2D158A4A828A263F3" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_477317D9939D1C2A67F3A4A82892A610" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_2AC8A6F82442DA65959AA4A828A262EF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_477317D9939D1C2A67F3A4A82892A610" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_2AC8A6F82442DA65959AA4A828A262EF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_836A4F781E1CE805A4D5A4A828A2B403" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_EB75FD6C677FD9E2D158A4A828A263F3" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_836A4F781E1CE805A4D5A4A828A2B403" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/DescriptionOfBusiness" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/DescriptionOfBusinessDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:label="loc_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems_5551D2E28EAC846B1F837A0F3F74B198" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable" xlink:label="loc_us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable_D81A4B8F2F4E5A717F9F7A0F3F732B40" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems_5551D2E28EAC846B1F837A0F3F74B198" xlink:to="loc_us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable_D81A4B8F2F4E5A717F9F7A0F3F732B40" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_CounterpartyNameAxis" xlink:label="loc_srt_CounterpartyNameAxis_7E7F2590BEEDD5F0ECED7A0F3F73543B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable_D81A4B8F2F4E5A717F9F7A0F3F732B40" xlink:to="loc_srt_CounterpartyNameAxis_7E7F2590BEEDD5F0ECED7A0F3F73543B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RepurchaseAgreementCounterpartyNameDomain" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_F5DA4D057F016941FA707A0F3F73B82D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_7E7F2590BEEDD5F0ECED7A0F3F73543B" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_F5DA4D057F016941FA707A0F3F73B82D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RepurchaseAgreementCounterpartyNameDomain" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_F5DA4D057F016941FA707A0F3F73B82D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_7E7F2590BEEDD5F0ECED7A0F3F73543B" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_F5DA4D057F016941FA707A0F3F73B82D" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_BungieInc.DestinyPublishingRightsMember" xlink:label="loc_atvi_BungieInc.DestinyPublishingRightsMember_FDFF5D1606C4ED87519E7A0F3F74F2F3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_F5DA4D057F016941FA707A0F3F73B82D" xlink:to="loc_atvi_BungieInc.DestinyPublishingRightsMember_FDFF5D1606C4ED87519E7A0F3F74F2F3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_2C7C7449BD6A2C5718F57A0F3F7414E7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems_5551D2E28EAC846B1F837A0F3F74B198" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_2C7C7449BD6A2C5718F57A0F3F7414E7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_A4F05CC9C14A889092FA7A0F3F75F5DC" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems_5551D2E28EAC846B1F837A0F3F74B198" xlink:to="loc_us-gaap_OperatingIncomeLoss_A4F05CC9C14A889092FA7A0F3F75F5DC" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/FairValueMeasurements" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/FairValueMeasurementsForeignCurrencyForwardContractsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativesFairValueLineItems" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_A9EE35B55E2B22CC6058793258C4F2DF" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_BAEE3FCC6969153FA663793258C0C224" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_A9EE35B55E2B22CC6058793258C4F2DF" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_BAEE3FCC6969153FA663793258C0C224" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_B56FF9710202EAC1B423793258C082ED" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_BAEE3FCC6969153FA663793258C0C224" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_B56FF9710202EAC1B423793258C082ED" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_05F5E4A7298814AF195E793258C0AB29_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_B56FF9710202EAC1B423793258C082ED" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_05F5E4A7298814AF195E793258C0AB29_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_05F5E4A7298814AF195E793258C0AB29" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_B56FF9710202EAC1B423793258C082ED" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_05F5E4A7298814AF195E793258C0AB29" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_BuyUSDSellEURMember" xlink:label="loc_atvi_BuyUSDSellEURMember_6D694A43727AF2ACBD5C7934E6001242" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_05F5E4A7298814AF195E793258C0AB29" xlink:to="loc_atvi_BuyUSDSellEURMember_6D694A43727AF2ACBD5C7934E6001242" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignExchangeForwardMember" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_75B1E0C242D306D7D8ED79474603128C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_05F5E4A7298814AF195E793258C0AB29" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_75B1E0C242D306D7D8ED79474603128C" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_BuyUSDSellGBPMember" xlink:label="loc_atvi_BuyUSDSellGBPMember_362AE508A73309CF5868793258C120E0" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_05F5E4A7298814AF195E793258C0AB29" xlink:to="loc_atvi_BuyUSDSellGBPMember_362AE508A73309CF5868793258C120E0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_HedgingDesignationAxis" xlink:label="loc_us-gaap_HedgingDesignationAxis_2A3B172CA8ABD79C8B36793258C249CE" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_BAEE3FCC6969153FA663793258C0C224" xlink:to="loc_us-gaap_HedgingDesignationAxis_2A3B172CA8ABD79C8B36793258C249CE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_471C444270506968A762793258C2FC2D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_2A3B172CA8ABD79C8B36793258C249CE" xlink:to="loc_us-gaap_HedgingDesignationDomain_471C444270506968A762793258C2FC2D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_471C444270506968A762793258C2FC2D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_2A3B172CA8ABD79C8B36793258C249CE" xlink:to="loc_us-gaap_HedgingDesignationDomain_471C444270506968A762793258C2FC2D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DesignatedAsHedgingInstrumentMember" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_5BC5AA8F49D107F4A31D793258C251C7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_471C444270506968A762793258C2FC2D" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_5BC5AA8F49D107F4A31D793258C251C7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NondesignatedMember" xlink:label="loc_us-gaap_NondesignatedMember_E3EBC097FDCEA773A489793258C29AC5" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_471C444270506968A762793258C2FC2D" xlink:to="loc_us-gaap_NondesignatedMember_E3EBC097FDCEA773A489793258C29AC5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_70E646EE4C93A4FCC3AA793258C3A920" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_BAEE3FCC6969153FA663793258C0C224" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_70E646EE4C93A4FCC3AA793258C3A920" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_HedgingRelationshipDomain" xlink:label="loc_us-gaap_HedgingRelationshipDomain_4D37ED4B676C3F597F88793258C33F24_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_70E646EE4C93A4FCC3AA793258C3A920" xlink:to="loc_us-gaap_HedgingRelationshipDomain_4D37ED4B676C3F597F88793258C33F24_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_HedgingRelationshipDomain" xlink:label="loc_us-gaap_HedgingRelationshipDomain_4D37ED4B676C3F597F88793258C33F24" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_70E646EE4C93A4FCC3AA793258C3A920" xlink:to="loc_us-gaap_HedgingRelationshipDomain_4D37ED4B676C3F597F88793258C33F24" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashFlowHedgingMember" xlink:label="loc_us-gaap_CashFlowHedgingMember_1B8D05362DC1B9E07022793258C37127" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_4D37ED4B676C3F597F88793258C33F24" xlink:to="loc_us-gaap_CashFlowHedgingMember_1B8D05362DC1B9E07022793258C37127" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_EB4D00613319016223C0793258C46B84" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_BAEE3FCC6969153FA663793258C0C224" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_EB4D00613319016223C0793258C46B84" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_8D01F80A5753EB3545F5793258C489AC_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_EB4D00613319016223C0793258C46B84" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_8D01F80A5753EB3545F5793258C489AC_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_8D01F80A5753EB3545F5793258C489AC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_EB4D00613319016223C0793258C46B84" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_8D01F80A5753EB3545F5793258C489AC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember_27046B3C775E9B4041DF793258C4DE86" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_8D01F80A5753EB3545F5793258C489AC" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember_27046B3C775E9B4041DF793258C4DE86" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeNotionalAmount" xlink:label="loc_us-gaap_DerivativeNotionalAmount_B8BA6BF2CDBB8C84F930793258C541DC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_A9EE35B55E2B22CC6058793258C4F2DF" xlink:to="loc_us-gaap_DerivativeNotionalAmount_B8BA6BF2CDBB8C84F930793258C541DC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeNet" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeNet_3D1158D9157875470BCA793258C5C8B5" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_A9EE35B55E2B22CC6058793258C4F2DF" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeNet_3D1158D9157875470BCA793258C5C8B5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeRemainingMaturity1" xlink:label="loc_us-gaap_DerivativeRemainingMaturity1_674686DD1D1FE76CFB3A793258C56C24" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_A9EE35B55E2B22CC6058793258C4F2DF" xlink:to="loc_us-gaap_DerivativeRemainingMaturity1_674686DD1D1FE76CFB3A793258C56C24" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_DeferredCashFlowHedgeGainLosstobeReclassifiedwithinTwelveMonths" xlink:label="loc_atvi_DeferredCashFlowHedgeGainLosstobeReclassifiedwithinTwelveMonths_4E5C5614AF74444E9E29793258C51365" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_A9EE35B55E2B22CC6058793258C4F2DF" xlink:to="loc_atvi_DeferredCashFlowHedgeGainLosstobeReclassifiedwithinTwelveMonths_4E5C5614AF74444E9E29793258C51365" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_DeferredCashFlowHedgeGainLossinAOCI" xlink:label="loc_atvi_DeferredCashFlowHedgeGainLossinAOCI_4BABF6D8CDD5B50B6E50793258C57EB2" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_A9EE35B55E2B22CC6058793258C4F2DF" xlink:to="loc_atvi_DeferredCashFlowHedgeGainLossinAOCI_4BABF6D8CDD5B50B6E50793258C57EB2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_C0CAC2F10CDE0B632AA3793258C63FE2" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_A9EE35B55E2B22CC6058793258C4F2DF" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_C0CAC2F10CDE0B632AA3793258C63FE2" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/FairValueMeasurementsNonRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_7694487B28B177ABCFAEA8BC6DFEFB80" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C63DDB1B6D165E5B87F4A8BC6DFD1734" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_7694487B28B177ABCFAEA8BC6DFEFB80" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C63DDB1B6D165E5B87F4A8BC6DFD1734" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_255542FF29323008CC4FA8BC6DFD3C5A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C63DDB1B6D165E5B87F4A8BC6DFD1734" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_255542FF29323008CC4FA8BC6DFD3C5A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_DC259E40BDB859824A14A8BC6DFDBC2F_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_255542FF29323008CC4FA8BC6DFD3C5A" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_DC259E40BDB859824A14A8BC6DFDBC2F_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_DC259E40BDB859824A14A8BC6DFDBC2F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_255542FF29323008CC4FA8BC6DFD3C5A" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_DC259E40BDB859824A14A8BC6DFDBC2F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementsNonrecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsNonrecurringMember_8878F20FBF57C990712DA8BC6DFDDFD7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_DC259E40BDB859824A14A8BC6DFDBC2F" xlink:to="loc_us-gaap_FairValueMeasurementsNonrecurringMember_8878F20FBF57C990712DA8BC6DFDDFD7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount" xlink:label="loc_us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount_180F91B64A5D7EAD13F7A8C0D1F9B3F3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_7694487B28B177ABCFAEA8BC6DFEFB80" xlink:to="loc_us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount_180F91B64A5D7EAD13F7A8C0D1F9B3F3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueAmount" xlink:label="loc_us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueAmount_7ABE79ED294701727917A8C27A6282E9" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_7694487B28B177ABCFAEA8BC6DFEFB80" xlink:to="loc_us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueAmount_7ABE79ED294701727917A8C27A6282E9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetImpairmentCharges" xlink:label="loc_us-gaap_AssetImpairmentCharges_1A54EB10BEFA4E31FE48A8BC6DFE9455" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_7694487B28B177ABCFAEA8BC6DFEFB80" xlink:to="loc_us-gaap_AssetImpairmentCharges_1A54EB10BEFA4E31FE48A8BC6DFE9455" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/FairValueMeasurementsRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_D0B2BAF33F884FFCBFB2A885F8DC171C" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_2DB8F76ACBE4D5DFE616A885F8DC899C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_D0B2BAF33F884FFCBFB2A885F8DC171C" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_2DB8F76ACBE4D5DFE616A885F8DC899C" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_52740BE86C00CB961D1CA885F8DC0464" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_2DB8F76ACBE4D5DFE616A885F8DC899C" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_52740BE86C00CB961D1CA885F8DC0464" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_288C79D52BD6495B4CF1A885F8DCEF98_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_52740BE86C00CB961D1CA885F8DC0464" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_288C79D52BD6495B4CF1A885F8DCEF98_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_288C79D52BD6495B4CF1A885F8DCEF98" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_52740BE86C00CB961D1CA885F8DC0464" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_288C79D52BD6495B4CF1A885F8DCEF98" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_9E8070BDC9567921D4D8A885F8DC5B8D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_288C79D52BD6495B4CF1A885F8DCEF98" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_9E8070BDC9567921D4D8A885F8DC5B8D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BalanceSheetLocationAxis" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_C6566D71A9071550A895A885F8DCC0D3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_2DB8F76ACBE4D5DFE616A885F8DC899C" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_C6566D71A9071550A895A885F8DCC0D3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_721B9FA9EA53C7EACA17A885F8DC5A3C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_C6566D71A9071550A895A885F8DCC0D3" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_721B9FA9EA53C7EACA17A885F8DC5A3C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_721B9FA9EA53C7EACA17A885F8DC5A3C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_C6566D71A9071550A895A885F8DCC0D3" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_721B9FA9EA53C7EACA17A885F8DC5A3C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashAndCashEquivalentsMember" xlink:label="loc_us-gaap_CashAndCashEquivalentsMember_3CED988B530ED07C986DA885F8DC7A9B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_721B9FA9EA53C7EACA17A885F8DC5A3C" xlink:to="loc_us-gaap_CashAndCashEquivalentsMember_3CED988B530ED07C986DA885F8DC7A9B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherCurrentAssetsMember" xlink:label="loc_us-gaap_OtherCurrentAssetsMember_D0010D34993F9C9BF37EA885F8DCEDDB" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_721B9FA9EA53C7EACA17A885F8DC5A3C" xlink:to="loc_us-gaap_OtherCurrentAssetsMember_D0010D34993F9C9BF37EA885F8DCEDDB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherCurrentLiabilitiesMember" xlink:label="loc_us-gaap_OtherCurrentLiabilitiesMember_F5FC802388EF73578C07A885F8DCD8AA" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_721B9FA9EA53C7EACA17A885F8DC5A3C" xlink:to="loc_us-gaap_OtherCurrentLiabilitiesMember_F5FC802388EF73578C07A885F8DCD8AA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_B83E9AC7F9BB0DCA3DB4A885F8DCDEA1" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_2DB8F76ACBE4D5DFE616A885F8DC899C" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_B83E9AC7F9BB0DCA3DB4A885F8DCDEA1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_5876CBDEB28E8FA33558A885F8DCF927_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_B83E9AC7F9BB0DCA3DB4A885F8DCDEA1" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_5876CBDEB28E8FA33558A885F8DCF927_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_5876CBDEB28E8FA33558A885F8DCF927" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_B83E9AC7F9BB0DCA3DB4A885F8DCDEA1" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_5876CBDEB28E8FA33558A885F8DCF927" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_5586A0115CEAB7F69073A885F8DC129F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_5876CBDEB28E8FA33558A885F8DCF927" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_5586A0115CEAB7F69073A885F8DC129F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_06D5CA5C487FD14FB3B8A885F8DCF837" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_5876CBDEB28E8FA33558A885F8DCF927" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_06D5CA5C487FD14FB3B8A885F8DCF837" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_3091899308ABFC7393D4A885F8DCEA1B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_5876CBDEB28E8FA33558A885F8DCF927" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_3091899308ABFC7393D4A885F8DCEA1B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InvestmentTypeAxis" xlink:label="loc_us-gaap_InvestmentTypeAxis_FF353246845A1BF8EE33A885F8DC1236" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_2DB8F76ACBE4D5DFE616A885F8DC899C" xlink:to="loc_us-gaap_InvestmentTypeAxis_FF353246845A1BF8EE33A885F8DC1236" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_B00C5CB5D31E0BDADA67A885F8DCE3A1_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_FF353246845A1BF8EE33A885F8DC1236" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_B00C5CB5D31E0BDADA67A885F8DCE3A1_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_B00C5CB5D31E0BDADA67A885F8DCE3A1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_FF353246845A1BF8EE33A885F8DC1236" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_B00C5CB5D31E0BDADA67A885F8DCE3A1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MoneyMarketFundsMember" xlink:label="loc_us-gaap_MoneyMarketFundsMember_CD9707C52260BF7AE631A885F8DC99F8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_B00C5CB5D31E0BDADA67A885F8DCE3A1" xlink:to="loc_us-gaap_MoneyMarketFundsMember_CD9707C52260BF7AE631A885F8DC99F8" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_ForeignGovernmentTreasuryBillsMember" xlink:label="loc_atvi_ForeignGovernmentTreasuryBillsMember_BC79A4D6B685658393B0A885F8DC116D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_B00C5CB5D31E0BDADA67A885F8DCE3A1" xlink:to="loc_atvi_ForeignGovernmentTreasuryBillsMember_BC79A4D6B685658393B0A885F8DC116D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember" xlink:label="loc_us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember_EB929551FACD802F6925A885F8DCFD76" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_B00C5CB5D31E0BDADA67A885F8DCE3A1" xlink:to="loc_us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember_EB929551FACD802F6925A885F8DCFD76" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignExchangeForwardMember" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_25606535A1E5637E07D7A885F8DC378B" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_B00C5CB5D31E0BDADA67A885F8DCE3A1" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_25606535A1E5637E07D7A885F8DC378B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_HedgingDesignationAxis" xlink:label="loc_us-gaap_HedgingDesignationAxis_80B0603B9C688605926EA885F8DC6602" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_2DB8F76ACBE4D5DFE616A885F8DC899C" xlink:to="loc_us-gaap_HedgingDesignationAxis_80B0603B9C688605926EA885F8DC6602" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_24071A1B35C6E2335B82A885F8DC775F_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_80B0603B9C688605926EA885F8DC6602" xlink:to="loc_us-gaap_HedgingDesignationDomain_24071A1B35C6E2335B82A885F8DC775F_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_24071A1B35C6E2335B82A885F8DC775F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_80B0603B9C688605926EA885F8DC6602" xlink:to="loc_us-gaap_HedgingDesignationDomain_24071A1B35C6E2335B82A885F8DC775F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DesignatedAsHedgingInstrumentMember" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_F36CC04B573308B2173BA885F8DC8960" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_24071A1B35C6E2335B82A885F8DC775F" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_F36CC04B573308B2173BA885F8DC8960" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NondesignatedMember" xlink:label="loc_us-gaap_NondesignatedMember_F5ED3FFC88E415F628FFA885F8DC706E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_24071A1B35C6E2335B82A885F8DC775F" xlink:to="loc_us-gaap_NondesignatedMember_F5ED3FFC88E415F628FFA885F8DC706E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsFairValueDisclosure" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_7B79E31AA53AEDCE0A0AA885F8DC706C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_D0B2BAF33F884FFCBFB2A885F8DC171C" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_7B79E31AA53AEDCE0A0AA885F8DC706C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarningsAbstract" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarningsAbstract_8079013F31B67BD8E63FA885F8DCE9A4" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_D0B2BAF33F884FFCBFB2A885F8DC171C" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarningsAbstract_8079013F31B67BD8E63FA885F8DCE9A4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosure" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_BA960E11776EA9DB3901A885F8DC537B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarningsAbstract_8079013F31B67BD8E63FA885F8DCE9A4" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_BA960E11776EA9DB3901A885F8DC537B" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/FairValueMeasurementsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/Goodwill" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/GoodwillDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillLineItems" xlink:label="loc_us-gaap_GoodwillLineItems_C1824D2B0F598E3DA3F0A4A829DA0C99" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfGoodwillTable" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_98AF11821F8CD5801AFCA4A829DA13AB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_C1824D2B0F598E3DA3F0A4A829DA0C99" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_98AF11821F8CD5801AFCA4A829DA13AB" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_ACDDAA0ACDE3AA054038A4A829DABF7B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_98AF11821F8CD5801AFCA4A829DA13AB" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_ACDDAA0ACDE3AA054038A4A829DABF7B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_E16A3860904182D872D5A4A829DA1EC9_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_ACDDAA0ACDE3AA054038A4A829DABF7B" xlink:to="loc_us-gaap_SegmentDomain_E16A3860904182D872D5A4A829DA1EC9_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_E16A3860904182D872D5A4A829DA1EC9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_ACDDAA0ACDE3AA054038A4A829DABF7B" xlink:to="loc_us-gaap_SegmentDomain_E16A3860904182D872D5A4A829DA1EC9" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_ActivisionMember" xlink:label="loc_atvi_ActivisionMember_5D938CEB038BAEADA06BA4A829DA66BD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_E16A3860904182D872D5A4A829DA1EC9" xlink:to="loc_atvi_ActivisionMember_5D938CEB038BAEADA06BA4A829DA66BD" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_BlizzardMember" xlink:label="loc_atvi_BlizzardMember_36A66C52725E0A393390A4A829DA3648" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_E16A3860904182D872D5A4A829DA1EC9" xlink:to="loc_atvi_BlizzardMember_36A66C52725E0A393390A4A829DA3648" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_KingDigitalEntertainmentMember" xlink:label="loc_atvi_KingDigitalEntertainmentMember_5ED78B0B1D5F858D55A7A4A829DA1D6D" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_E16A3860904182D872D5A4A829DA1EC9" xlink:to="loc_atvi_KingDigitalEntertainmentMember_5ED78B0B1D5F858D55A7A4A829DA1D6D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillRollForward" xlink:label="loc_us-gaap_GoodwillRollForward_D692B05BC534A241B3EAA4A829DA86B7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_C1824D2B0F598E3DA3F0A4A829DA0C99" xlink:to="loc_us-gaap_GoodwillRollForward_D692B05BC534A241B3EAA4A829DA86B7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_1E72440ACA829BCA3EBBA4A829DADC27" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_D692B05BC534A241B3EAA4A829DA86B7" xlink:to="loc_us-gaap_Goodwill_1E72440ACA829BCA3EBBA4A829DADC27" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillOtherIncreaseDecrease" xlink:label="loc_us-gaap_GoodwillOtherIncreaseDecrease_57E8BAEABCBA2B42640EA4A829DA5D32" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_D692B05BC534A241B3EAA4A829DA86B7" xlink:to="loc_us-gaap_GoodwillOtherIncreaseDecrease_57E8BAEABCBA2B42640EA4A829DA5D32" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillImpairedAccumulatedImpairmentLoss" xlink:label="loc_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_91490EA172F27ED4C896A4A829DAA5D0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_C1824D2B0F598E3DA3F0A4A829DA0C99" xlink:to="loc_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_91490EA172F27ED4C896A4A829DAA5D0" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/GoodwillTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/IncomeTaxes" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/IncomeTaxesComponentsOfNetDeferredTaxAssetsLiabilitiesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/IncomeTaxesEffectiveTaxRateReconciliationDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/IncomeTaxesIncomeLossBeforeIncomeTaxesAndIncomeTaxExpenseBenefitDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/IncomeTaxesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="atvi-20191231.xsd#atvi_IncomeTaxLineItems" xlink:label="loc_atvi_IncomeTaxLineItems_44A7AED09831E400BF0E7E898FC54E37" xlink:type="locator" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_IncomeTaxesTable" xlink:label="loc_atvi_IncomeTaxesTable_0B4EBB9AFDD5D07341C57E898FBF1A4C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_atvi_IncomeTaxLineItems_44A7AED09831E400BF0E7E898FC54E37" xlink:to="loc_atvi_IncomeTaxesTable_0B4EBB9AFDD5D07341C57E898FBF1A4C" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxAuthorityNameAxis" xlink:label="loc_us-gaap_IncomeTaxAuthorityNameAxis_4F07A75F8D0175F8F4EA7E898FBF0369" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_atvi_IncomeTaxesTable_0B4EBB9AFDD5D07341C57E898FBF1A4C" xlink:to="loc_us-gaap_IncomeTaxAuthorityNameAxis_4F07A75F8D0175F8F4EA7E898FBF0369" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxAuthorityNameDomain" xlink:label="loc_us-gaap_IncomeTaxAuthorityNameDomain_AC1D227717D2AA3C502D7E898FC06180_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityNameAxis_4F07A75F8D0175F8F4EA7E898FBF0369" xlink:to="loc_us-gaap_IncomeTaxAuthorityNameDomain_AC1D227717D2AA3C502D7E898FC06180_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxAuthorityNameDomain" xlink:label="loc_us-gaap_IncomeTaxAuthorityNameDomain_AC1D227717D2AA3C502D7E898FC06180" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityNameAxis_4F07A75F8D0175F8F4EA7E898FBF0369" xlink:to="loc_us-gaap_IncomeTaxAuthorityNameDomain_AC1D227717D2AA3C502D7E898FC06180" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_HerMajestysRevenueAndCustomsHMRCMember" xlink:label="loc_us-gaap_HerMajestysRevenueAndCustomsHMRCMember_5862949218F8E781F8347E898FC0A829" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityNameDomain_AC1D227717D2AA3C502D7E898FC06180" xlink:to="loc_us-gaap_HerMajestysRevenueAndCustomsHMRCMember_5862949218F8E781F8347E898FC0A829" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_28F7271EE929DF2225757E898FC09DC8" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_atvi_IncomeTaxesTable_0B4EBB9AFDD5D07341C57E898FBF1A4C" xlink:to="loc_srt_RangeAxis_28F7271EE929DF2225757E898FC09DC8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_7C239EF2FA8EACFF50757E898FC0157C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_28F7271EE929DF2225757E898FC09DC8" xlink:to="loc_srt_RangeMember_7C239EF2FA8EACFF50757E898FC0157C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_7C239EF2FA8EACFF50757E898FC0157C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_28F7271EE929DF2225757E898FC09DC8" xlink:to="loc_srt_RangeMember_7C239EF2FA8EACFF50757E898FC0157C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_A8BDF712AFB2ECBFBD957E898FC16648" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_7C239EF2FA8EACFF50757E898FC0157C" xlink:to="loc_srt_MinimumMember_A8BDF712AFB2ECBFBD957E898FC16648" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_680CEB38CCE4A27B347A7E898FC15909" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_7C239EF2FA8EACFF50757E898FC0157C" xlink:to="loc_srt_MaximumMember_680CEB38CCE4A27B347A7E898FC15909" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_LitigationCaseAxis" xlink:label="loc_srt_LitigationCaseAxis_4FD2CD17B6B2B865C9F57E898FC19F5A" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_atvi_IncomeTaxesTable_0B4EBB9AFDD5D07341C57E898FBF1A4C" xlink:to="loc_srt_LitigationCaseAxis_4FD2CD17B6B2B865C9F57E898FC19F5A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_LitigationCaseTypeDomain" xlink:label="loc_srt_LitigationCaseTypeDomain_849775CAA456F2832C0E7E898FC1A201_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_LitigationCaseAxis_4FD2CD17B6B2B865C9F57E898FC19F5A" xlink:to="loc_srt_LitigationCaseTypeDomain_849775CAA456F2832C0E7E898FC1A201_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_LitigationCaseTypeDomain" xlink:label="loc_srt_LitigationCaseTypeDomain_849775CAA456F2832C0E7E898FC1A201" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_LitigationCaseAxis_4FD2CD17B6B2B865C9F57E898FC19F5A" xlink:to="loc_srt_LitigationCaseTypeDomain_849775CAA456F2832C0E7E898FC1A201" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_SettlementFromClosingAgreementMember" xlink:label="loc_atvi_SettlementFromClosingAgreementMember_7B0AC24DD7E195B6A1307E898FC1378F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_849775CAA456F2832C0E7E898FC1A201" xlink:to="loc_atvi_SettlementFromClosingAgreementMember_7B0AC24DD7E195B6A1307E898FC1378F" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_IndirectTaxBenefitsDuetoClosingAgreementMember" xlink:label="loc_atvi_IndirectTaxBenefitsDuetoClosingAgreementMember_25F3BF227CCDA08779DF7E898FC2A760" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_849775CAA456F2832C0E7E898FC1A201" xlink:to="loc_atvi_IndirectTaxBenefitsDuetoClosingAgreementMember_25F3BF227CCDA08779DF7E898FC2A760" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxAuthorityAxis" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_5E88D21D5951CCE26E4B7E898FC276D5" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_atvi_IncomeTaxesTable_0B4EBB9AFDD5D07341C57E898FBF1A4C" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_5E88D21D5951CCE26E4B7E898FC276D5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_E8D93151C683728AC1AA7E898FC2E613_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_5E88D21D5951CCE26E4B7E898FC276D5" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_E8D93151C683728AC1AA7E898FC2E613_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_E8D93151C683728AC1AA7E898FC2E613" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_5E88D21D5951CCE26E4B7E898FC276D5" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_E8D93151C683728AC1AA7E898FC2E613" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DomesticCountryMember" xlink:label="loc_us-gaap_DomesticCountryMember_BAAD7529C6ED070C24587E898FC2E78E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_E8D93151C683728AC1AA7E898FC2E613" xlink:to="loc_us-gaap_DomesticCountryMember_BAAD7529C6ED070C24587E898FC2E78E" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_SwedishTaxAgencyMember" xlink:label="loc_atvi_SwedishTaxAgencyMember_398EA2B190E9C7D4B73D7E898FC2B7C4" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_E8D93151C683728AC1AA7E898FC2E613" xlink:to="loc_atvi_SwedishTaxAgencyMember_398EA2B190E9C7D4B73D7E898FC2B7C4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MinistryOfTheEconomyFinanceAndIndustryFranceMember" xlink:label="loc_us-gaap_MinistryOfTheEconomyFinanceAndIndustryFranceMember_FE7CCA7F743405A9C8F77E898FC3BAE4" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_E8D93151C683728AC1AA7E898FC2E613" xlink:to="loc_us-gaap_MinistryOfTheEconomyFinanceAndIndustryFranceMember_FE7CCA7F743405A9C8F77E898FC3BAE4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TaxCreditCarryforwardAxis" xlink:label="loc_us-gaap_TaxCreditCarryforwardAxis_30C7C80989083D7652FE7E898FC3F0B0" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_atvi_IncomeTaxesTable_0B4EBB9AFDD5D07341C57E898FBF1A4C" xlink:to="loc_us-gaap_TaxCreditCarryforwardAxis_30C7C80989083D7652FE7E898FC3F0B0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TaxCreditCarryforwardNameDomain" xlink:label="loc_us-gaap_TaxCreditCarryforwardNameDomain_D38D682C2FF79E5E68D27E898FC397FB_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TaxCreditCarryforwardAxis_30C7C80989083D7652FE7E898FC3F0B0" xlink:to="loc_us-gaap_TaxCreditCarryforwardNameDomain_D38D682C2FF79E5E68D27E898FC397FB_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TaxCreditCarryforwardNameDomain" xlink:label="loc_us-gaap_TaxCreditCarryforwardNameDomain_D38D682C2FF79E5E68D27E898FC397FB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TaxCreditCarryforwardAxis_30C7C80989083D7652FE7E898FC3F0B0" xlink:to="loc_us-gaap_TaxCreditCarryforwardNameDomain_D38D682C2FF79E5E68D27E898FC397FB" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_StateMember" xlink:label="loc_atvi_StateMember_2A40607803FFEB44F2997E898FC3F80F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxCreditCarryforwardNameDomain_D38D682C2FF79E5E68D27E898FC397FB" xlink:to="loc_atvi_StateMember_2A40607803FFEB44F2997E898FC3F80F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ResearchMember" xlink:label="loc_us-gaap_ResearchMember_69CB99AD9134A2DD4B057E898FC325D2" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxCreditCarryforwardNameDomain_D38D682C2FF79E5E68D27E898FC397FB" xlink:to="loc_us-gaap_ResearchMember_69CB99AD9134A2DD4B057E898FC325D2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_35A2A6CA99E7EBBE2FC97E898FC4A594" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_atvi_IncomeTaxesTable_0B4EBB9AFDD5D07341C57E898FBF1A4C" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_35A2A6CA99E7EBBE2FC97E898FC4A594" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_B9ED28B7C48055170B8C7E898FC4B82C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_35A2A6CA99E7EBBE2FC97E898FC4A594" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_B9ED28B7C48055170B8C7E898FC4B82C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_B9ED28B7C48055170B8C7E898FC4B82C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_35A2A6CA99E7EBBE2FC97E898FC4A594" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_B9ED28B7C48055170B8C7E898FC4B82C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_us-gaap_SubsequentEventMember_CF6DD904086CB41F56267E898FC4A6D0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_B9ED28B7C48055170B8C7E898FC4B82C" xlink:to="loc_us-gaap_SubsequentEventMember_CF6DD904086CB41F56267E898FC4A6D0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_7B5B1D09DB9AEC2A2C3F7E898FC4B804" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_atvi_IncomeTaxesTable_0B4EBB9AFDD5D07341C57E898FBF1A4C" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_7B5B1D09DB9AEC2A2C3F7E898FC4B804" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_83870196F14045792D317E898FC4B17D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_7B5B1D09DB9AEC2A2C3F7E898FC4B804" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_83870196F14045792D317E898FC4B17D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_83870196F14045792D317E898FC4B17D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_7B5B1D09DB9AEC2A2C3F7E898FC4B804" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_83870196F14045792D317E898FC4B17D" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_KingDigitalEntertainmentMember" xlink:label="loc_atvi_KingDigitalEntertainmentMember_F24E4519DC81AB575EB27E898FC5670C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_83870196F14045792D317E898FC4B17D" xlink:to="loc_atvi_KingDigitalEntertainmentMember_F24E4519DC81AB575EB27E898FC5670C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_55CDAFAAE95E45253EB87E898FC58027" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxLineItems_44A7AED09831E400BF0E7E898FC54E37" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_55CDAFAAE95E45253EB87E898FC58027" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_455E19000BB51CBD020F7E898FC6EBF6" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxLineItems_44A7AED09831E400BF0E7E898FC54E37" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_455E19000BB51CBD020F7E898FC6EBF6" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_NetDeferredTaxAssetIntraentityTransferAssetOtherthanInventory" xlink:label="loc_atvi_NetDeferredTaxAssetIntraentityTransferAssetOtherthanInventory_497B753A62E765FE1BF17E898FC6DDD4" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxLineItems_44A7AED09831E400BF0E7E898FC54E37" xlink:to="loc_atvi_NetDeferredTaxAssetIntraentityTransferAssetOtherthanInventory_497B753A62E765FE1BF17E898FC6DDD4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings_787F5D0DA951FC17E75C7E898FC6F86C" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxLineItems_44A7AED09831E400BF0E7E898FC54E37" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings_787F5D0DA951FC17E75C7E898FC6F86C" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_AmortizableTaxBasisRecoveryPeriod" xlink:label="loc_atvi_AmortizableTaxBasisRecoveryPeriod_A038032D330143D418797E898FC6E0EC" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxLineItems_44A7AED09831E400BF0E7E898FC54E37" xlink:to="loc_atvi_AmortizableTaxBasisRecoveryPeriod_A038032D330143D418797E898FC6E0EC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxAssetsValuationAllowance" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_1CBE2B706922D048758D7E898FC62308" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxLineItems_44A7AED09831E400BF0E7E898FC54E37" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_1CBE2B706922D048758D7E898FC62308" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions" xlink:label="loc_us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions_F73252D3B62D5037F44E7E898FC65260" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxLineItems_44A7AED09831E400BF0E7E898FC54E37" xlink:to="loc_us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions_F73252D3B62D5037F44E7E898FC65260" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities_E0B629C7B6D83B6900F97E898FC775C9" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxLineItems_44A7AED09831E400BF0E7E898FC54E37" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities_E0B629C7B6D83B6900F97E898FC775C9" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_IncomeTaxesPaidTaxSettlement" xlink:label="loc_atvi_IncomeTaxesPaidTaxSettlement_15CB18CB54D2DBAC4FD57E898FC706A1" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxLineItems_44A7AED09831E400BF0E7E898FC54E37" xlink:to="loc_atvi_IncomeTaxesPaidTaxSettlement_15CB18CB54D2DBAC4FD57E898FC706A1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TaxCutsAndJobsActOf2017MeasurementPeriodAdjustmentIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_TaxCutsAndJobsActOf2017MeasurementPeriodAdjustmentIncomeTaxExpenseBenefit_0B941E5CC2BB60AEC7D77E898FC7F618" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxLineItems_44A7AED09831E400BF0E7E898FC54E37" xlink:to="loc_us-gaap_TaxCutsAndJobsActOf2017MeasurementPeriodAdjustmentIncomeTaxExpenseBenefit_0B941E5CC2BB60AEC7D77E898FC7F618" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TaxCreditCarryforwardAmount" xlink:label="loc_us-gaap_TaxCreditCarryforwardAmount_BB531C05644DC2D0F9FE7E898FC79CD9" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxLineItems_44A7AED09831E400BF0E7E898FC54E37" xlink:to="loc_us-gaap_TaxCreditCarryforwardAmount_BB531C05644DC2D0F9FE7E898FC79CD9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign" xlink:label="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign_10FDA70CC2D28A22CDEA7E898FC72EC7" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxLineItems_44A7AED09831E400BF0E7E898FC54E37" xlink:to="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign_10FDA70CC2D28A22CDEA7E898FC72EC7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition_4628942387D5DBEC0BF67E898FC7676B" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxLineItems_44A7AED09831E400BF0E7E898FC54E37" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition_4628942387D5DBEC0BF67E898FC7676B" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_IncomeTaxExaminationTotalAssessmentPenaltiesAndInterest" xlink:label="loc_atvi_IncomeTaxExaminationTotalAssessmentPenaltiesAndInterest_93867899FEF92B290CC57E898FC7BE22" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxLineItems_44A7AED09831E400BF0E7E898FC54E37" xlink:to="loc_atvi_IncomeTaxExaminationTotalAssessmentPenaltiesAndInterest_93867899FEF92B290CC57E898FC7BE22" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_IncomeTaxExaminationTaxPaymentIncludingPenaltiesandInterest" xlink:label="loc_atvi_IncomeTaxExaminationTaxPaymentIncludingPenaltiesandInterest_E118D7A41747F4A7FC9D7E898FC8B219" xlink:type="locator" />
    <link:definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxLineItems_44A7AED09831E400BF0E7E898FC54E37" xlink:to="loc_atvi_IncomeTaxExaminationTaxPaymentIncludingPenaltiesandInterest_E118D7A41747F4A7FC9D7E898FC8B219" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnrecognizedTaxBenefits" xlink:label="loc_us-gaap_UnrecognizedTaxBenefits_6AA03F55CFF12C86079C7E898FC8721D" xlink:type="locator" />
    <link:definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxLineItems_44A7AED09831E400BF0E7E898FC54E37" xlink:to="loc_us-gaap_UnrecognizedTaxBenefits_6AA03F55CFF12C86079C7E898FC8721D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_CE028EFBC25FDB8D440D7E898FC8AC1B" xlink:type="locator" />
    <link:definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxLineItems_44A7AED09831E400BF0E7E898FC54E37" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_CE028EFBC25FDB8D440D7E898FC8AC1B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_72726810CD6FE4EFAB237E898FC8475E" xlink:type="locator" />
    <link:definitionArc order="18" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxLineItems_44A7AED09831E400BF0E7E898FC54E37" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_72726810CD6FE4EFAB237E898FC8475E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense_129E12DAA01C1F5DE6967E898FC8DA7F" xlink:type="locator" />
    <link:definitionArc order="19" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxLineItems_44A7AED09831E400BF0E7E898FC54E37" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense_129E12DAA01C1F5DE6967E898FC8DA7F" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/IncomeTaxesReconciliationOfTotalGrossUnrecognizedTaxBenefitsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/IncomeTaxesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/IntangibleAssetsNet" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/IntangibleAssetsNetDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_F311DDDDDC20CD64BB46A8BC6E42D520" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable" xlink:label="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_BA049D2EED3D9D365784A8BC6E3FD480" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_F311DDDDDC20CD64BB46A8BC6E42D520" xlink:to="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_BA049D2EED3D9D365784A8BC6E3FD480" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_E3077C257AEA9819E5ABA8BC6E3FFBF9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_BA049D2EED3D9D365784A8BC6E3FD480" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_E3077C257AEA9819E5ABA8BC6E3FFBF9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_146BEC38B9EFFE629BD4A8BC6E40699B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_E3077C257AEA9819E5ABA8BC6E3FFBF9" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_146BEC38B9EFFE629BD4A8BC6E40699B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_146BEC38B9EFFE629BD4A8BC6E40699B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_E3077C257AEA9819E5ABA8BC6E3FFBF9" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_146BEC38B9EFFE629BD4A8BC6E40699B" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_InternallyDevelopedFranchisesMember" xlink:label="loc_atvi_InternallyDevelopedFranchisesMember_940765E03DA19C8779DBA8BC6E40A39D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_146BEC38B9EFFE629BD4A8BC6E40699B" xlink:to="loc_atvi_InternallyDevelopedFranchisesMember_940765E03DA19C8779DBA8BC6E40A39D" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_DevelopedSoftwareMember" xlink:label="loc_atvi_DevelopedSoftwareMember_125C3F1251B8F84C1F6BA8BC6E40F5A7" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_146BEC38B9EFFE629BD4A8BC6E40699B" xlink:to="loc_atvi_DevelopedSoftwareMember_125C3F1251B8F84C1F6BA8BC6E40F5A7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CustomerRelatedIntangibleAssetsMember" xlink:label="loc_us-gaap_CustomerRelatedIntangibleAssetsMember_2EA26A71FC43E8F5319FA8BC6E4046B5" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_146BEC38B9EFFE629BD4A8BC6E40699B" xlink:to="loc_us-gaap_CustomerRelatedIntangibleAssetsMember_2EA26A71FC43E8F5319FA8BC6E4046B5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TradeNamesMember" xlink:label="loc_us-gaap_TradeNamesMember_DAF212449103D370AC27A8BC6E401E8F" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_146BEC38B9EFFE629BD4A8BC6E40699B" xlink:to="loc_us-gaap_TradeNamesMember_DAF212449103D370AC27A8BC6E401E8F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherIntangibleAssetsMember" xlink:label="loc_us-gaap_OtherIntangibleAssetsMember_363A9317E1CF00795F52A8BC6E410018" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_146BEC38B9EFFE629BD4A8BC6E40699B" xlink:to="loc_us-gaap_OtherIntangibleAssetsMember_363A9317E1CF00795F52A8BC6E410018" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_449A3AF5806B89375355A8BC6E41B945" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_BA049D2EED3D9D365784A8BC6E3FD480" xlink:to="loc_srt_RangeAxis_449A3AF5806B89375355A8BC6E41B945" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_B93EC395CA6F0AD7CB9EA8BC6E41D441_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_449A3AF5806B89375355A8BC6E41B945" xlink:to="loc_srt_RangeMember_B93EC395CA6F0AD7CB9EA8BC6E41D441_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_B93EC395CA6F0AD7CB9EA8BC6E41D441" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_449A3AF5806B89375355A8BC6E41B945" xlink:to="loc_srt_RangeMember_B93EC395CA6F0AD7CB9EA8BC6E41D441" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_B14FA5E28D17CE6BCBF0A8BC6E412AE7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_B93EC395CA6F0AD7CB9EA8BC6E41D441" xlink:to="loc_srt_MinimumMember_B14FA5E28D17CE6BCBF0A8BC6E412AE7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_686957ED795936E96BE4A8BC6E417E46" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_B93EC395CA6F0AD7CB9EA8BC6E41D441" xlink:to="loc_srt_MaximumMember_686957ED795936E96BE4A8BC6E417E46" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_F267B8129B7AA321AA05A8BC6E42DA71" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_F311DDDDDC20CD64BB46A8BC6E42D520" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_F267B8129B7AA321AA05A8BC6E42DA71" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_0C9206654FF23C91769BA8BC6E42D55A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_F311DDDDDC20CD64BB46A8BC6E42D520" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_0C9206654FF23C91769BA8BC6E42D55A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_DCE7637102AFECA925D7A8BC6E42ECFB" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_F311DDDDDC20CD64BB46A8BC6E42D520" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_DCE7637102AFECA925D7A8BC6E42ECFB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_670DCEDFF888EFDD73FAA8BC6E4211C4" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_F311DDDDDC20CD64BB46A8BC6E42D520" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_670DCEDFF888EFDD73FAA8BC6E4211C4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AcquiredIndefiniteLivedIntangibleAssetsLineItems" xlink:label="loc_us-gaap_AcquiredIndefiniteLivedIntangibleAssetsLineItems_6C063988DFC93068A044A8BC6E438A25" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfAcquiredIndefiniteLivedIntangibleAssetsByMajorClassTable" xlink:label="loc_us-gaap_ScheduleOfAcquiredIndefiniteLivedIntangibleAssetsByMajorClassTable_3A2FD27296CB5035AF88A8BC6E42781B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AcquiredIndefiniteLivedIntangibleAssetsLineItems_6C063988DFC93068A044A8BC6E438A25" xlink:to="loc_us-gaap_ScheduleOfAcquiredIndefiniteLivedIntangibleAssetsByMajorClassTable_3A2FD27296CB5035AF88A8BC6E42781B" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_3A0A33C6E171C5CA54A6A8BC6E42F0C5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAcquiredIndefiniteLivedIntangibleAssetsByMajorClassTable_3A2FD27296CB5035AF88A8BC6E42781B" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_3A0A33C6E171C5CA54A6A8BC6E42F0C5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_04A3594BAFF92EA26E58A8BC6E42408C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_3A0A33C6E171C5CA54A6A8BC6E42F0C5" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_04A3594BAFF92EA26E58A8BC6E42408C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_04A3594BAFF92EA26E58A8BC6E42408C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_3A0A33C6E171C5CA54A6A8BC6E42F0C5" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_04A3594BAFF92EA26E58A8BC6E42408C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TrademarksMember" xlink:label="loc_us-gaap_TrademarksMember_E7E8BBB8E012537220BDA8BC6E423961" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_04A3594BAFF92EA26E58A8BC6E42408C" xlink:to="loc_us-gaap_TrademarksMember_E7E8BBB8E012537220BDA8BC6E423961" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TradeNamesMember" xlink:label="loc_us-gaap_TradeNamesMember_A98303CD33CDE011087DA8BC6E4325E7" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_04A3594BAFF92EA26E58A8BC6E42408C" xlink:to="loc_us-gaap_TradeNamesMember_A98303CD33CDE011087DA8BC6E4325E7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_EB8D6B6DB4CD651584A5A8BC6E43A24A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredIndefiniteLivedIntangibleAssetsLineItems_6C063988DFC93068A044A8BC6E438A25" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_EB8D6B6DB4CD651584A5A8BC6E43A24A" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/IntangibleAssetsNetFutureAmortizationScheduleDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/IntangibleAssetsNetTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/InterestAndOtherExpenseIncomeNet" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/InterestAndOtherExpenseIncomeNetDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/InterestAndOtherExpenseIncomeNetTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/Leases" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/LeasesFutureMinimumLeasePaymentsPriorToAdoptionOfLeaseStandardDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/LeasesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeLeaseDescriptionLineItems" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_4AD1437596FF6BDBF59C7934FFDB2C0D" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeLeaseDescriptionTable" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_8E54BFC1F65E67FE87457934FFDA3AC8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_4AD1437596FF6BDBF59C7934FFDB2C0D" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_8E54BFC1F65E67FE87457934FFDA3AC8" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_A11C6E99ADECC38345047934FFDA49BC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_8E54BFC1F65E67FE87457934FFDA3AC8" xlink:to="loc_srt_RangeAxis_A11C6E99ADECC38345047934FFDA49BC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_DDA247F7EFD99DF4E68E7934FFDB15B8_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_A11C6E99ADECC38345047934FFDA49BC" xlink:to="loc_srt_RangeMember_DDA247F7EFD99DF4E68E7934FFDB15B8_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_DDA247F7EFD99DF4E68E7934FFDB15B8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_A11C6E99ADECC38345047934FFDA49BC" xlink:to="loc_srt_RangeMember_DDA247F7EFD99DF4E68E7934FFDB15B8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_FDE3F176B1F98D8D2E737934FFDB7015" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_DDA247F7EFD99DF4E68E7934FFDB15B8" xlink:to="loc_srt_MinimumMember_FDE3F176B1F98D8D2E737934FFDB7015" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_6F98E00E84C4910738187934FFDB56D6" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_DDA247F7EFD99DF4E68E7934FFDB15B8" xlink:to="loc_srt_MaximumMember_6F98E00E84C4910738187934FFDB56D6" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_LesseeOperatingLeaseRemainingLeaseTerm" xlink:label="loc_atvi_LesseeOperatingLeaseRemainingLeaseTerm_F5E799A99183888429817934FFDCDE82" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_4AD1437596FF6BDBF59C7934FFDB2C0D" xlink:to="loc_atvi_LesseeOperatingLeaseRemainingLeaseTerm_F5E799A99183888429817934FFDCDE82" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseRenewalTerm" xlink:label="loc_us-gaap_LesseeOperatingLeaseRenewalTerm_940B2DEF2949D0E9850F7934FFDC438F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_4AD1437596FF6BDBF59C7934FFDB2C0D" xlink:to="loc_us-gaap_LesseeOperatingLeaseRenewalTerm_940B2DEF2949D0E9850F7934FFDC438F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesRentExpenseNet" xlink:label="loc_us-gaap_OperatingLeasesRentExpenseNet_ADB6AC026FA1ED68CBC779384FDB51C2" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_4AD1437596FF6BDBF59C7934FFDB2C0D" xlink:to="loc_us-gaap_OperatingLeasesRentExpenseNet_ADB6AC026FA1ED68CBC779384FDB51C2" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_LesseeOperatingLeaseLeaseNotyetCommencedLiability" xlink:label="loc_atvi_LesseeOperatingLeaseLeaseNotyetCommencedLiability_DB22D31E97B2F58BE4F97934FFDC06D3" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_4AD1437596FF6BDBF59C7934FFDB2C0D" xlink:to="loc_atvi_LesseeOperatingLeaseLeaseNotyetCommencedLiability_DB22D31E97B2F58BE4F97934FFDC06D3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1" xlink:label="loc_us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1_6AD0A4C95C72D6EE1EF97934FFDDFA30" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_4AD1437596FF6BDBF59C7934FFDB2C0D" xlink:to="loc_us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1_6AD0A4C95C72D6EE1EF97934FFDDFA30" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/LeasesScheduleOfFutureLeasePaymentsUnderNonCancellableOperatingLeasesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/LeasesScheduleOfLeaseExpenseAndOtherDetailsRelatedToOperatingLeasesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/LeasesScheduleOfOperatingRouAssetsAndLeaseLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeLeaseDescriptionLineItems" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_E2D63B0DD5D41441B3955F93A73DC6DC" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeLeaseDescriptionTable" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_5F734FE78F6FEBC36DEE5F93A7382D1D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_E2D63B0DD5D41441B3955F93A73DC6DC" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_5F734FE78F6FEBC36DEE5F93A7382D1D" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BalanceSheetLocationAxis" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_1DEF6E807503E9AC8F985F93A739CF20" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_5F734FE78F6FEBC36DEE5F93A7382D1D" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_1DEF6E807503E9AC8F985F93A739CF20" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_66C79236935E9084ABCF5F93A7399A19_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_1DEF6E807503E9AC8F985F93A739CF20" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_66C79236935E9084ABCF5F93A7399A19_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_66C79236935E9084ABCF5F93A7399A19" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_1DEF6E807503E9AC8F985F93A739CF20" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_66C79236935E9084ABCF5F93A7399A19" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsMember" xlink:label="loc_us-gaap_OtherAssetsMember_2D3822975E226E3247375F93A73A0528" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_66C79236935E9084ABCF5F93A7399A19" xlink:to="loc_us-gaap_OtherAssetsMember_2D3822975E226E3247375F93A73A0528" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccruedLiabilitiesMember" xlink:label="loc_us-gaap_AccruedLiabilitiesMember_28D9AC87E5EC60BA743D5F93A73C600A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_66C79236935E9084ABCF5F93A7399A19" xlink:to="loc_us-gaap_AccruedLiabilitiesMember_28D9AC87E5EC60BA743D5F93A73C600A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherNoncurrentLiabilitiesMember" xlink:label="loc_us-gaap_OtherNoncurrentLiabilitiesMember_EE993D588F37EAA823825F93A73C33F3" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_66C79236935E9084ABCF5F93A7399A19" xlink:to="loc_us-gaap_OtherNoncurrentLiabilitiesMember_EE993D588F37EAA823825F93A73C33F3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_A44FF00A57F32E8B8B815F93A73D7438" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_E2D63B0DD5D41441B3955F93A73DC6DC" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_A44FF00A57F32E8B8B815F93A73D7438" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_9545A3EC9D5CB346BA895F93A73D4092" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_E2D63B0DD5D41441B3955F93A73DC6DC" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_9545A3EC9D5CB346BA895F93A73D4092" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_FEE496D5C9B4916550505F93A73DDD9C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_E2D63B0DD5D41441B3955F93A73DC6DC" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_FEE496D5C9B4916550505F93A73DDD9C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="loc_us-gaap_OperatingLeaseLiability_F30BA8D89F33950614675F93A73D86EE" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_E2D63B0DD5D41441B3955F93A73DC6DC" xlink:to="loc_us-gaap_OperatingLeaseLiability_F30BA8D89F33950614675F93A73D86EE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_75661D7D4B9A136B982F5F93A73E7697" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_E2D63B0DD5D41441B3955F93A73DC6DC" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_75661D7D4B9A136B982F5F93A73E7697" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_23385881826401F3629F5F93A73E2455" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_E2D63B0DD5D41441B3955F93A73DC6DC" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_23385881826401F3629F5F93A73E2455" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList" xlink:label="loc_us-gaap_OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList_06789F9A7AE9C66FEA245F93A76BEBF9" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_E2D63B0DD5D41441B3955F93A73DC6DC" xlink:to="loc_us-gaap_OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList_06789F9A7AE9C66FEA245F93A76BEBF9" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/LeasesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/OperatingSegmentsAndGeographicRegions" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/OperatingSegmentsAndGeographicRegionsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_E5F87FA711DC60270D5D5A7C387E8581" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_F67EBADC02C1DFD121135A7C3871D4FF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_E5F87FA711DC60270D5D5A7C387E8581" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_F67EBADC02C1DFD121135A7C3871D4FF" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidationItemsAxis" xlink:label="loc_srt_ConsolidationItemsAxis_ED6369DF180F1E4976395A7C3871D844" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_F67EBADC02C1DFD121135A7C3871D4FF" xlink:to="loc_srt_ConsolidationItemsAxis_ED6369DF180F1E4976395A7C3871D844" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidationItemsDomain" xlink:label="loc_srt_ConsolidationItemsDomain_2559B0D329721171F1965A7C387128D0_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_ED6369DF180F1E4976395A7C3871D844" xlink:to="loc_srt_ConsolidationItemsDomain_2559B0D329721171F1965A7C387128D0_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidationItemsDomain" xlink:label="loc_srt_ConsolidationItemsDomain_2559B0D329721171F1965A7C387128D0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_ED6369DF180F1E4976395A7C3871D844" xlink:to="loc_srt_ConsolidationItemsDomain_2559B0D329721171F1965A7C387128D0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingSegmentsMember" xlink:label="loc_us-gaap_OperatingSegmentsMember_3E6E657025906D5EB0465A7C38712D39" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_2559B0D329721171F1965A7C387128D0" xlink:to="loc_us-gaap_OperatingSegmentsMember_3E6E657025906D5EB0465A7C38712D39" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CorporateNonSegmentMember" xlink:label="loc_us-gaap_CorporateNonSegmentMember_58061C35470BCB238DB55A7C3872DBFC" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_2559B0D329721171F1965A7C387128D0" xlink:to="loc_us-gaap_CorporateNonSegmentMember_58061C35470BCB238DB55A7C3872DBFC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MaterialReconcilingItemsMember" xlink:label="loc_us-gaap_MaterialReconcilingItemsMember_7EBD059246A51E4188D05A7C38721DCB" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_2559B0D329721171F1965A7C387128D0" xlink:to="loc_us-gaap_MaterialReconcilingItemsMember_7EBD059246A51E4188D05A7C38721DCB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IntersegmentEliminationMember" xlink:label="loc_us-gaap_IntersegmentEliminationMember_F29613AD13D0513498F95A7C3872E56C" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_2559B0D329721171F1965A7C387128D0" xlink:to="loc_us-gaap_IntersegmentEliminationMember_F29613AD13D0513498F95A7C3872E56C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_71B8627E18DF23800B855A7C3872C975" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_F67EBADC02C1DFD121135A7C3871D4FF" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_71B8627E18DF23800B855A7C3872C975" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_A072A35477C4EA34A5245A7C38728BBB_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_71B8627E18DF23800B855A7C3872C975" xlink:to="loc_us-gaap_SegmentDomain_A072A35477C4EA34A5245A7C38728BBB_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_A072A35477C4EA34A5245A7C38728BBB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_71B8627E18DF23800B855A7C3872C975" xlink:to="loc_us-gaap_SegmentDomain_A072A35477C4EA34A5245A7C38728BBB" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_ActivisionMember" xlink:label="loc_atvi_ActivisionMember_B817635C91B83ACC94ED5A7C387372C9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_A072A35477C4EA34A5245A7C38728BBB" xlink:to="loc_atvi_ActivisionMember_B817635C91B83ACC94ED5A7C387372C9" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_BlizzardMember" xlink:label="loc_atvi_BlizzardMember_6E37E1CCB1929B3CF2A65A7C38731F3E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_A072A35477C4EA34A5245A7C38728BBB" xlink:to="loc_atvi_BlizzardMember_6E37E1CCB1929B3CF2A65A7C38731F3E" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_KingDigitalEntertainmentMember" xlink:label="loc_atvi_KingDigitalEntertainmentMember_AEB1CB43B71618BC89585A7C3873DE22" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_A072A35477C4EA34A5245A7C38728BBB" xlink:to="loc_atvi_KingDigitalEntertainmentMember_AEB1CB43B71618BC89585A7C3873DE22" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CorporateAndOtherMember" xlink:label="loc_us-gaap_CorporateAndOtherMember_691E355C1F815D5395545A7C38730B55" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_A072A35477C4EA34A5245A7C38728BBB" xlink:to="loc_us-gaap_CorporateAndOtherMember_691E355C1F815D5395545A7C38730B55" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskByTypeAxis" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_436CC7D5801CED227A385A7C38731486" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_F67EBADC02C1DFD121135A7C3871D4FF" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_436CC7D5801CED227A385A7C38731486" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_10F392990BAFFA436F6F5A7C38794D92_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_436CC7D5801CED227A385A7C38731486" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_10F392990BAFFA436F6F5A7C38794D92_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_10F392990BAFFA436F6F5A7C38794D92" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_436CC7D5801CED227A385A7C38731486" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_10F392990BAFFA436F6F5A7C38794D92" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GeographicConcentrationRiskMember" xlink:label="loc_us-gaap_GeographicConcentrationRiskMember_35A620E4463577B4B3F15A7C387900CC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_10F392990BAFFA436F6F5A7C38794D92" xlink:to="loc_us-gaap_GeographicConcentrationRiskMember_35A620E4463577B4B3F15A7C387900CC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_23D29D1412FE4C47FAF45A7C387981C0" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_F67EBADC02C1DFD121135A7C3871D4FF" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_23D29D1412FE4C47FAF45A7C387981C0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_63F78BE96D21257A327E5A7C3879F46F_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_23D29D1412FE4C47FAF45A7C387981C0" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_63F78BE96D21257A327E5A7C3879F46F_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_63F78BE96D21257A327E5A7C3879F46F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_23D29D1412FE4C47FAF45A7C387981C0" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_63F78BE96D21257A327E5A7C3879F46F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SalesRevenueNetMember" xlink:label="loc_us-gaap_SalesRevenueNetMember_68FAD25DD7B18DC4215A5A7C387A89CA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_63F78BE96D21257A327E5A7C3879F46F" xlink:to="loc_us-gaap_SalesRevenueNetMember_68FAD25DD7B18DC4215A5A7C387A89CA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_StatementGeographicalAxis" xlink:label="loc_srt_StatementGeographicalAxis_80A13130D37EA247FEE45A7C387AF5BD" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_F67EBADC02C1DFD121135A7C3871D4FF" xlink:to="loc_srt_StatementGeographicalAxis_80A13130D37EA247FEE45A7C387AF5BD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_E1F3ACBAD440299454EC5A7C387A5C00_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_80A13130D37EA247FEE45A7C387AF5BD" xlink:to="loc_srt_SegmentGeographicalDomain_E1F3ACBAD440299454EC5A7C387A5C00_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_E1F3ACBAD440299454EC5A7C387A5C00" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_80A13130D37EA247FEE45A7C387AF5BD" xlink:to="loc_srt_SegmentGeographicalDomain_E1F3ACBAD440299454EC5A7C387A5C00" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_AmericasMember" xlink:label="loc_srt_AmericasMember_91A3BA6B1F65BB18C39B5A7C387A1F39" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_E1F3ACBAD440299454EC5A7C387A5C00" xlink:to="loc_srt_AmericasMember_91A3BA6B1F65BB18C39B5A7C387A1F39" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EMEAMember" xlink:label="loc_us-gaap_EMEAMember_B95CA5C4BE1544DB1D635A7C387B438C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_E1F3ACBAD440299454EC5A7C387A5C00" xlink:to="loc_us-gaap_EMEAMember_B95CA5C4BE1544DB1D635A7C387B438C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_AsiaPacificMember" xlink:label="loc_srt_AsiaPacificMember_CE9E7FC80302D6E4B83F5A7C387B999A" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_E1F3ACBAD440299454EC5A7C387A5C00" xlink:to="loc_srt_AsiaPacificMember_CE9E7FC80302D6E4B83F5A7C387B999A" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_US" xlink:label="loc_country_US_53ED0CF0E5DC566180295A7C387B69A8" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_E1F3ACBAD440299454EC5A7C387A5C00" xlink:to="loc_country_US_53ED0CF0E5DC566180295A7C387B69A8" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_GB" xlink:label="loc_country_GB_CB93511480EB90159ED85A7C387CA2EE" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_E1F3ACBAD440299454EC5A7C387A5C00" xlink:to="loc_country_GB_CB93511480EB90159ED85A7C387CA2EE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ProductOrServiceAxis" xlink:label="loc_srt_ProductOrServiceAxis_B8CA0F26EB875596855D5A7C387CB96F" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_F67EBADC02C1DFD121135A7C3871D4FF" xlink:to="loc_srt_ProductOrServiceAxis_B8CA0F26EB875596855D5A7C387CB96F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_B8A2F846BE4FC1BDB0655A7C387C5327_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_B8CA0F26EB875596855D5A7C387CB96F" xlink:to="loc_srt_ProductsAndServicesDomain_B8A2F846BE4FC1BDB0655A7C387C5327_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_B8A2F846BE4FC1BDB0655A7C387C5327" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_B8CA0F26EB875596855D5A7C387CB96F" xlink:to="loc_srt_ProductsAndServicesDomain_B8A2F846BE4FC1BDB0655A7C387C5327" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_RevenueExternalCustomersMember" xlink:label="loc_atvi_RevenueExternalCustomersMember_28DAAB6F898E50389CC15A7C387CF5E9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_B8A2F846BE4FC1BDB0655A7C387C5327" xlink:to="loc_atvi_RevenueExternalCustomersMember_28DAAB6F898E50389CC15A7C387CF5E9" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_RevenueIntersegmentMember" xlink:label="loc_atvi_RevenueIntersegmentMember_ADAA52576EACDD182E985A7C387CD7D7" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_B8A2F846BE4FC1BDB0655A7C387C5327" xlink:to="loc_atvi_RevenueIntersegmentMember_ADAA52576EACDD182E985A7C387CD7D7" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_DigitalOnlineChannelsMember" xlink:label="loc_atvi_DigitalOnlineChannelsMember_1A6B1722DE3DFD48D0395A7C387C4FBB" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_B8A2F846BE4FC1BDB0655A7C387C5327" xlink:to="loc_atvi_DigitalOnlineChannelsMember_1A6B1722DE3DFD48D0395A7C387C4FBB" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_RetailChannelsMember" xlink:label="loc_atvi_RetailChannelsMember_E2EE24E48C3DF1B9ECFB5A7C387D1CCA" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_B8A2F846BE4FC1BDB0655A7C387C5327" xlink:to="loc_atvi_RetailChannelsMember_E2EE24E48C3DF1B9ECFB5A7C387D1CCA" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_OtherDistributionChannelsMember" xlink:label="loc_atvi_OtherDistributionChannelsMember_973D042862FDF734241C5A7C387D87FC" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_B8A2F846BE4FC1BDB0655A7C387C5327" xlink:to="loc_atvi_OtherDistributionChannelsMember_973D042862FDF734241C5A7C387D87FC" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_ConsoleMember" xlink:label="loc_atvi_ConsoleMember_DF3932F77BB648B2815B5A7C387DD19A" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_B8A2F846BE4FC1BDB0655A7C387C5327" xlink:to="loc_atvi_ConsoleMember_DF3932F77BB648B2815B5A7C387DD19A" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_PCMember" xlink:label="loc_atvi_PCMember_BF0E41566D53C57203285A7C387DAB78" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_B8A2F846BE4FC1BDB0655A7C387C5327" xlink:to="loc_atvi_PCMember_BF0E41566D53C57203285A7C387DAB78" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_MobileAndAncillaryPlatformsMember" xlink:label="loc_atvi_MobileAndAncillaryPlatformsMember_6AF999B10A4251B888265A7C387DCF68" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_B8A2F846BE4FC1BDB0655A7C387C5327" xlink:to="loc_atvi_MobileAndAncillaryPlatformsMember_6AF999B10A4251B888265A7C387DCF68" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_OtherPlatformMember" xlink:label="loc_atvi_OtherPlatformMember_4A33C82532650E2D4AB05A7C387EB536" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_B8A2F846BE4FC1BDB0655A7C387C5327" xlink:to="loc_atvi_OtherPlatformMember_4A33C82532650E2D4AB05A7C387EB536" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_SegmentRevenues" xlink:label="loc_atvi_SegmentRevenues_B29AD3C3A9F9BF75535D5A7C387EB427" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_E5F87FA711DC60270D5D5A7C387E8581" xlink:to="loc_atvi_SegmentRevenues_B29AD3C3A9F9BF75535D5A7C387EB427" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_47B689F7DDA3F859B4E75A7C387E9752" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_E5F87FA711DC60270D5D5A7C387E8581" xlink:to="loc_us-gaap_OperatingIncomeLoss_47B689F7DDA3F859B4E75A7C387E9752" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_DeferralOfNetRevenuesAndRelatedCostOfSalesRevenueImpact" xlink:label="loc_atvi_DeferralOfNetRevenuesAndRelatedCostOfSalesRevenueImpact_6ED745595674AFF24F975A7C387E4F86" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_E5F87FA711DC60270D5D5A7C387E8581" xlink:to="loc_atvi_DeferralOfNetRevenuesAndRelatedCostOfSalesRevenueImpact_6ED745595674AFF24F975A7C387E4F86" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_411C20AB64EC57AD58AC5A7C387FAC87" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_E5F87FA711DC60270D5D5A7C387E8581" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_411C20AB64EC57AD58AC5A7C387FAC87" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_DeferralOfNetRevenuesAndRelatedCostOfSalesOperatingIncomeImpact" xlink:label="loc_atvi_DeferralOfNetRevenuesAndRelatedCostOfSalesOperatingIncomeImpact_A157D689A7C9847CEAC65A7C387FAB03" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_E5F87FA711DC60270D5D5A7C387E8581" xlink:to="loc_atvi_DeferralOfNetRevenuesAndRelatedCostOfSalesOperatingIncomeImpact_A157D689A7C9847CEAC65A7C387FAB03" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_41F36EFE404CE269B79F5A7C387FECBB" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_E5F87FA711DC60270D5D5A7C387E8581" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_41F36EFE404CE269B79F5A7C387FECBB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_AB933797D9B7C0D030C65A7C387FAE19" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_E5F87FA711DC60270D5D5A7C387E8581" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_AB933797D9B7C0D030C65A7C387FAE19" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_FeesAndOtherExpensesRelatedToAcquisitions" xlink:label="loc_atvi_FeesAndOtherExpensesRelatedToAcquisitions_736F238874DFC70B79725A7C387FC0BC" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_E5F87FA711DC60270D5D5A7C387E8581" xlink:to="loc_atvi_FeesAndOtherExpensesRelatedToAcquisitions_736F238874DFC70B79725A7C387FC0BC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringCharges" xlink:label="loc_us-gaap_RestructuringCharges_C27CC02F327476B35FA75A7C387F0BEC" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_E5F87FA711DC60270D5D5A7C387E8581" xlink:to="loc_us-gaap_RestructuringCharges_C27CC02F327476B35FA75A7C387F0BEC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherGeneralExpense" xlink:label="loc_us-gaap_OtherGeneralExpense_7A17CADD82FF5B9D95C85A7C38800D4C" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_E5F87FA711DC60270D5D5A7C387E8581" xlink:to="loc_us-gaap_OtherGeneralExpense_7A17CADD82FF5B9D95C85A7C38800D4C" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_DiscreteTaxRelatedItems" xlink:label="loc_atvi_DiscreteTaxRelatedItems_33857E8597655B19DDA65A7C38807EB9" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_E5F87FA711DC60270D5D5A7C387E8581" xlink:to="loc_atvi_DiscreteTaxRelatedItems_33857E8597655B19DDA65A7C38807EB9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_A08CBF6522FD95DD53AE5A7C3880C554" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_E5F87FA711DC60270D5D5A7C387E8581" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_A08CBF6522FD95DD53AE5A7C3880C554" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_2AC0960D577CFF8615475A7C38800EAE" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_E5F87FA711DC60270D5D5A7C387E8581" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_2AC0960D577CFF8615475A7C38800EAE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_20BB22321284D6AAE2665A7C38807BAC" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_E5F87FA711DC60270D5D5A7C387E8581" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_20BB22321284D6AAE2665A7C38807BAC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskPercentage1" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_6C4963B93CD7835171195A7C3880D70C" xlink:type="locator" />
    <link:definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_E5F87FA711DC60270D5D5A7C387E8581" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_6C4963B93CD7835171195A7C3880D70C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NoncurrentAssets" xlink:label="loc_us-gaap_NoncurrentAssets_C24AF8B306DF83F7C08D5A7F9AA5C7F8" xlink:type="locator" />
    <link:definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_E5F87FA711DC60270D5D5A7C387E8581" xlink:to="loc_us-gaap_NoncurrentAssets_C24AF8B306DF83F7C08D5A7F9AA5C7F8" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/OperatingSegmentsAndGeographicRegionsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/OtherAssetsAndLiabilities" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/OtherAssetsAndLiabilitiesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/PropertyAndEquipmentNet" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/PropertyAndEquipmentNetDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_046CB95433241266D1D5AA1CE178E190" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_452612420EC0C59FDC25AA1CE175C28B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_046CB95433241266D1D5AA1CE178E190" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_452612420EC0C59FDC25AA1CE175C28B" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_4C547FA1D3A8012CA21FAA1CE176DC10" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_452612420EC0C59FDC25AA1CE175C28B" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_4C547FA1D3A8012CA21FAA1CE176DC10" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_67C18B0A48BD3249FD3CAA1CE176326C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_4C547FA1D3A8012CA21FAA1CE176DC10" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_67C18B0A48BD3249FD3CAA1CE176326C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_67C18B0A48BD3249FD3CAA1CE176326C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_4C547FA1D3A8012CA21FAA1CE176DC10" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_67C18B0A48BD3249FD3CAA1CE176326C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LandMember" xlink:label="loc_us-gaap_LandMember_FDED65D11EFF72D4BCA2AA1CE17780C2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_67C18B0A48BD3249FD3CAA1CE176326C" xlink:to="loc_us-gaap_LandMember_FDED65D11EFF72D4BCA2AA1CE17780C2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BuildingMember" xlink:label="loc_us-gaap_BuildingMember_00269159EF3FC74C5E7EAA1CE177DD80" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_67C18B0A48BD3249FD3CAA1CE176326C" xlink:to="loc_us-gaap_BuildingMember_00269159EF3FC74C5E7EAA1CE177DD80" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeaseholdsAndLeaseholdImprovementsMember" xlink:label="loc_us-gaap_LeaseholdsAndLeaseholdImprovementsMember_2E1499A8E4290CE9367AAA1CE177BDBA" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_67C18B0A48BD3249FD3CAA1CE176326C" xlink:to="loc_us-gaap_LeaseholdsAndLeaseholdImprovementsMember_2E1499A8E4290CE9367AAA1CE177BDBA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ComputerEquipmentMember" xlink:label="loc_us-gaap_ComputerEquipmentMember_AF11F83856854D7520B0AA1CE177C0E2" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_67C18B0A48BD3249FD3CAA1CE176326C" xlink:to="loc_us-gaap_ComputerEquipmentMember_AF11F83856854D7520B0AA1CE177C0E2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FurnitureAndFixturesMember" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_67AD3AB4C51C5A3B35E7AA1CE178CA15" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_67C18B0A48BD3249FD3CAA1CE176326C" xlink:to="loc_us-gaap_FurnitureAndFixturesMember_67AD3AB4C51C5A3B35E7AA1CE178CA15" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_1A012192F6D9FD3EE3E7AA1CE17837C9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_046CB95433241266D1D5AA1CE178E190" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_1A012192F6D9FD3EE3E7AA1CE17837C9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_29993BAC1F8D40F23A8AAA1CE179933D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_046CB95433241266D1D5AA1CE178E190" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_29993BAC1F8D40F23A8AAA1CE179933D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_7B2E2B1BBC0A985EC942AA1CE1795F99" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_046CB95433241266D1D5AA1CE178E190" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_7B2E2B1BBC0A985EC942AA1CE1795F99" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Depreciation" xlink:label="loc_us-gaap_Depreciation_655BC8847E04931EBB6DAA1CE179C7A0" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_046CB95433241266D1D5AA1CE178E190" xlink:to="loc_us-gaap_Depreciation_655BC8847E04931EBB6DAA1CE179C7A0" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/PropertyAndEquipmentNetTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/QuarterlyFinancialInformationUnaudited" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/QuarterlyFinancialInformationUnauditedDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/QuarterlyFinancialInformationUnauditedTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/RecentlyIssuedAccountingPronouncements" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/RecentlyIssuedAccountingPronouncementsScheduleOfImpactOfAdoptionOnConsolidatedBalanceSheetDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_EC40D606824AD33CD71BA4A82A8611A5" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_0AE5298756F379776E45A4A82A862874" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_EC40D606824AD33CD71BA4A82A8611A5" xlink:to="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_0AE5298756F379776E45A4A82A862874" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_A75976201B3823986A7CA4A82A86AFCE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_0AE5298756F379776E45A4A82A862874" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_A75976201B3823986A7CA4A82A86AFCE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_45B22232AF657B0B6A93A4A82A863075_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_A75976201B3823986A7CA4A82A86AFCE" xlink:to="loc_us-gaap_TypeOfAdoptionMember_45B22232AF657B0B6A93A4A82A863075_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_45B22232AF657B0B6A93A4A82A863075" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_A75976201B3823986A7CA4A82A86AFCE" xlink:to="loc_us-gaap_TypeOfAdoptionMember_45B22232AF657B0B6A93A4A82A863075" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountingStandardsUpdate201602Member" xlink:label="loc_us-gaap_AccountingStandardsUpdate201602Member_163DB8F50148F313F539A4A82A86965A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfAdoptionMember_45B22232AF657B0B6A93A4A82A863075" xlink:to="loc_us-gaap_AccountingStandardsUpdate201602Member_163DB8F50148F313F539A4A82A86965A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BalanceSheetRelatedDisclosuresAbstract" xlink:label="loc_us-gaap_BalanceSheetRelatedDisclosuresAbstract_1B8388D30758DF14EB6DA4A82A86A16D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_EC40D606824AD33CD71BA4A82A8611A5" xlink:to="loc_us-gaap_BalanceSheetRelatedDisclosuresAbstract_1B8388D30758DF14EB6DA4A82A86A16D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaap_AssetsAbstract_6DC701ADE27564D018ADA4A82A867907" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetRelatedDisclosuresAbstract_1B8388D30758DF14EB6DA4A82A86A16D" xlink:to="loc_us-gaap_AssetsAbstract_6DC701ADE27564D018ADA4A82A867907" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsCurrent" xlink:label="loc_us-gaap_OtherAssetsCurrent_8CA977CC9F25DF18C72CA4A82A869870" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_6DC701ADE27564D018ADA4A82A867907" xlink:to="loc_us-gaap_OtherAssetsCurrent_8CA977CC9F25DF18C72CA4A82A869870" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_D8C9FF7CC98A83AB948EA4A82A86245C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_6DC701ADE27564D018ADA4A82A867907" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_D8C9FF7CC98A83AB948EA4A82A86245C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_D01C53994600C8F9DD99A4A82A860A38" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetRelatedDisclosuresAbstract_1B8388D30758DF14EB6DA4A82A86A16D" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_D01C53994600C8F9DD99A4A82A860A38" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_1CE7ABE6D12D6BA40EACA4A82A867D8B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_D01C53994600C8F9DD99A4A82A860A38" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_1CE7ABE6D12D6BA40EACA4A82A867D8B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_1C6235B177D9A215C427A4A82A8624E9" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_D01C53994600C8F9DD99A4A82A860A38" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_1C6235B177D9A215C427A4A82A8624E9" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/RecentlyIssuedAccountingPronouncementsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/Restructuring" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/RestructuringNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_6DCB299E623913AF5E3E35ECE335026A" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_5E6EA2CE194189E78C1435ECE32E66B0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_6DCB299E623913AF5E3E35ECE335026A" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_5E6EA2CE194189E78C1435ECE32E66B0" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_53C526C6C57D541E205D35ECE32EDB28" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_5E6EA2CE194189E78C1435ECE32E66B0" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_53C526C6C57D541E205D35ECE32EDB28" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_B27D6A5C4171E6A8632235ECE32FB026_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_53C526C6C57D541E205D35ECE32EDB28" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_B27D6A5C4171E6A8632235ECE32FB026_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_B27D6A5C4171E6A8632235ECE32FB026" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_53C526C6C57D541E205D35ECE32EDB28" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_B27D6A5C4171E6A8632235ECE32FB026" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostOfSalesMember" xlink:label="loc_us-gaap_CostOfSalesMember_27A4E5137D386BEC060335ECE334ED47" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_B27D6A5C4171E6A8632235ECE32FB026" xlink:to="loc_us-gaap_CostOfSalesMember_27A4E5137D386BEC060335ECE334ED47" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringCostAndReserveAxis" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_09B4C50EB1876D8BDF2735ECE334ACBC" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_5E6EA2CE194189E78C1435ECE32E66B0" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_09B4C50EB1876D8BDF2735ECE334ACBC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_5FEB3B0E497F3AC9865035ECE335176F_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_09B4C50EB1876D8BDF2735ECE334ACBC" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_5FEB3B0E497F3AC9865035ECE335176F_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_5FEB3B0E497F3AC9865035ECE335176F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_09B4C50EB1876D8BDF2735ECE334ACBC" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_5FEB3B0E497F3AC9865035ECE335176F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeSeveranceMember" xlink:label="loc_us-gaap_EmployeeSeveranceMember_DC8B8FA15C26687023F235ECE3354611" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_5FEB3B0E497F3AC9865035ECE335176F" xlink:to="loc_us-gaap_EmployeeSeveranceMember_DC8B8FA15C26687023F235ECE3354611" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FacilityClosingMember" xlink:label="loc_us-gaap_FacilityClosingMember_45D1747B7ADFAE88884635ECE335C92F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_5FEB3B0E497F3AC9865035ECE335176F" xlink:to="loc_us-gaap_FacilityClosingMember_45D1747B7ADFAE88884635ECE335C92F" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_AssetWriteDownsandOtherCostsMember" xlink:label="loc_atvi_AssetWriteDownsandOtherCostsMember_971A98AD189786A28C1C35ECE335743F" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_5FEB3B0E497F3AC9865035ECE335176F" xlink:to="loc_atvi_AssetWriteDownsandOtherCostsMember_971A98AD189786A28C1C35ECE335743F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_StatementScenarioAxis" xlink:label="loc_srt_StatementScenarioAxis_228D2A65C0C9CD560A7A3605274339BE" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_5E6EA2CE194189E78C1435ECE32E66B0" xlink:to="loc_srt_StatementScenarioAxis_228D2A65C0C9CD560A7A3605274339BE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScenarioUnspecifiedDomain" xlink:label="loc_srt_ScenarioUnspecifiedDomain_87A00723BE66B795021336052752A81B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_228D2A65C0C9CD560A7A3605274339BE" xlink:to="loc_srt_ScenarioUnspecifiedDomain_87A00723BE66B795021336052752A81B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScenarioUnspecifiedDomain" xlink:label="loc_srt_ScenarioUnspecifiedDomain_87A00723BE66B795021336052752A81B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_228D2A65C0C9CD560A7A3605274339BE" xlink:to="loc_srt_ScenarioUnspecifiedDomain_87A00723BE66B795021336052752A81B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScenarioForecastMember" xlink:label="loc_srt_ScenarioForecastMember_B4D2A9F31C2CCA7735F836055157CFD0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_87A00723BE66B795021336052752A81B" xlink:to="loc_srt_ScenarioForecastMember_B4D2A9F31C2CCA7735F836055157CFD0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryWriteDown" xlink:label="loc_us-gaap_InventoryWriteDown_EA9A6389990586554A0D35ECE336AF3C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_6DCB299E623913AF5E3E35ECE335026A" xlink:to="loc_us-gaap_InventoryWriteDown_EA9A6389990586554A0D35ECE336AF3C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringAndRelatedCostExpectedCost1" xlink:label="loc_us-gaap_RestructuringAndRelatedCostExpectedCost1_00F1E92107BE9C7EAFEE35ECE336CE4E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_6DCB299E623913AF5E3E35ECE335026A" xlink:to="loc_us-gaap_RestructuringAndRelatedCostExpectedCost1_00F1E92107BE9C7EAFEE35ECE336CE4E" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_RestructuringandRelatedCostExpectedCostPercentage" xlink:label="loc_atvi_RestructuringandRelatedCostExpectedCostPercentage_5CA8323B21332D23DA2235ECE33613CD" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_6DCB299E623913AF5E3E35ECE335026A" xlink:to="loc_atvi_RestructuringandRelatedCostExpectedCostPercentage_5CA8323B21332D23DA2235ECE33613CD" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/RestructuringScheduleOfAccruedRestructuringIncludedInAccruedExpensesAndOtherLiabilitiesByCostTypeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_6484E0035EA915621750F84BF7919E00" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_34A77622A63CBD5822C5F84BF7906BE9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_6484E0035EA915621750F84BF7919E00" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_34A77622A63CBD5822C5F84BF7906BE9" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringCostAndReserveAxis" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_59EC99B6C3B02B6EE67AF84BF790AC1F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_34A77622A63CBD5822C5F84BF7906BE9" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_59EC99B6C3B02B6EE67AF84BF790AC1F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_935855EE2AE361B3C026F84BF7911F6B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_59EC99B6C3B02B6EE67AF84BF790AC1F" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_935855EE2AE361B3C026F84BF7911F6B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_935855EE2AE361B3C026F84BF7911F6B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_59EC99B6C3B02B6EE67AF84BF790AC1F" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_935855EE2AE361B3C026F84BF7911F6B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeSeveranceMember" xlink:label="loc_us-gaap_EmployeeSeveranceMember_F08DEE40CA22BFC453DAF84BF7914F3E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_935855EE2AE361B3C026F84BF7911F6B" xlink:to="loc_us-gaap_EmployeeSeveranceMember_F08DEE40CA22BFC453DAF84BF7914F3E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FacilityClosingMember" xlink:label="loc_us-gaap_FacilityClosingMember_E3657A1EA16391014DA8F84BF7914D3F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_935855EE2AE361B3C026F84BF7911F6B" xlink:to="loc_us-gaap_FacilityClosingMember_E3657A1EA16391014DA8F84BF7914D3F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherRestructuringMember" xlink:label="loc_us-gaap_OtherRestructuringMember_3B1FFD3CEB560609563BF84BF7911906" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_935855EE2AE361B3C026F84BF7911F6B" xlink:to="loc_us-gaap_OtherRestructuringMember_3B1FFD3CEB560609563BF84BF7911906" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringReserveRollForward" xlink:label="loc_us-gaap_RestructuringReserveRollForward_30259CFF833535BFEC63F84BF792F2C6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_6484E0035EA915621750F84BF7919E00" xlink:to="loc_us-gaap_RestructuringReserveRollForward_30259CFF833535BFEC63F84BF792F2C6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringReserve" xlink:label="loc_us-gaap_RestructuringReserve_502413D9096175C15525F84BF792B577" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_30259CFF833535BFEC63F84BF792F2C6" xlink:to="loc_us-gaap_RestructuringReserve_502413D9096175C15525F84BF792B577" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringCharges" xlink:label="loc_us-gaap_RestructuringCharges_A9000250C2F8F2EB00FFF84BF7922FD8" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_30259CFF833535BFEC63F84BF792F2C6" xlink:to="loc_us-gaap_RestructuringCharges_A9000250C2F8F2EB00FFF84BF7922FD8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsForRestructuring" xlink:label="loc_us-gaap_PaymentsForRestructuring_CE54A65BED4529A9E818F84BF7929FE7" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_30259CFF833535BFEC63F84BF792F2C6" xlink:to="loc_us-gaap_PaymentsForRestructuring_CE54A65BED4529A9E818F84BF7929FE7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringReserveSettledWithoutCash2" xlink:label="loc_us-gaap_RestructuringReserveSettledWithoutCash2_107254D45FD482ADF9E6F84BF7930D18" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_30259CFF833535BFEC63F84BF792F2C6" xlink:to="loc_us-gaap_RestructuringReserveSettledWithoutCash2_107254D45FD482ADF9E6F84BF7930D18" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/RestructuringScheduleOfTotalExpectedPreTaxRestructuringChargesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_465A440F05ED1020B83C35ECE324212C" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_71C0F226868A16A133A635ECE31D349F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_465A440F05ED1020B83C35ECE324212C" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_71C0F226868A16A133A635ECE31D349F" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_8047EAAF17FDA37A2EB435ECE31E1B22" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_71C0F226868A16A133A635ECE31D349F" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_8047EAAF17FDA37A2EB435ECE31E1B22" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_41C72FC200D8EA564FC735ECE323CD50_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_8047EAAF17FDA37A2EB435ECE31E1B22" xlink:to="loc_us-gaap_SegmentDomain_41C72FC200D8EA564FC735ECE323CD50_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_41C72FC200D8EA564FC735ECE323CD50" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_8047EAAF17FDA37A2EB435ECE31E1B22" xlink:to="loc_us-gaap_SegmentDomain_41C72FC200D8EA564FC735ECE323CD50" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_ActivisionMember" xlink:label="loc_atvi_ActivisionMember_BB227ABB2ABB591716DC35ECE3236B8B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_41C72FC200D8EA564FC735ECE323CD50" xlink:to="loc_atvi_ActivisionMember_BB227ABB2ABB591716DC35ECE3236B8B" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_BlizzardMember" xlink:label="loc_atvi_BlizzardMember_981DA2BB2142D0F4975A35ECE324E6B0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_41C72FC200D8EA564FC735ECE323CD50" xlink:to="loc_atvi_BlizzardMember_981DA2BB2142D0F4975A35ECE324E6B0" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_KingDigitalEntertainmentMember" xlink:label="loc_atvi_KingDigitalEntertainmentMember_7A273CA5E1A3BA781EC135ECE324377F" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_41C72FC200D8EA564FC735ECE323CD50" xlink:to="loc_atvi_KingDigitalEntertainmentMember_7A273CA5E1A3BA781EC135ECE324377F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CorporateAndOtherMember" xlink:label="loc_us-gaap_CorporateAndOtherMember_810A8522AD91587A3A4135ECE3249CDF" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_41C72FC200D8EA564FC735ECE323CD50" xlink:to="loc_us-gaap_CorporateAndOtherMember_810A8522AD91587A3A4135ECE3249CDF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringAndRelatedCostExpectedCost1" xlink:label="loc_us-gaap_RestructuringAndRelatedCostExpectedCost1_B0DE94715C50E12D8CB635ECE3243640" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_465A440F05ED1020B83C35ECE324212C" xlink:to="loc_us-gaap_RestructuringAndRelatedCostExpectedCost1_B0DE94715C50E12D8CB635ECE3243640" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/RestructuringTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/RestructuringTotalRestructuringAndRelatedCostsBySegmentDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_B3DC34A05803DF0A52E0A4D594C005F3" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_DEDD2366F1A0FFA40FB0A4D594BE3053" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_B3DC34A05803DF0A52E0A4D594C005F3" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_DEDD2366F1A0FFA40FB0A4D594BE3053" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_76658BB1AE217667D646A4D594BE7BA5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_DEDD2366F1A0FFA40FB0A4D594BE3053" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_76658BB1AE217667D646A4D594BE7BA5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_33FB445D55952E7B7692A4D594BEE666_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_76658BB1AE217667D646A4D594BE7BA5" xlink:to="loc_us-gaap_SegmentDomain_33FB445D55952E7B7692A4D594BEE666_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_33FB445D55952E7B7692A4D594BEE666" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_76658BB1AE217667D646A4D594BE7BA5" xlink:to="loc_us-gaap_SegmentDomain_33FB445D55952E7B7692A4D594BEE666" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_ActivisionMember" xlink:label="loc_atvi_ActivisionMember_5623A7F06270716385E7A4D594BFC78E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_33FB445D55952E7B7692A4D594BEE666" xlink:to="loc_atvi_ActivisionMember_5623A7F06270716385E7A4D594BFC78E" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_BlizzardMember" xlink:label="loc_atvi_BlizzardMember_65C396CCC3311E3C674DA4D594BF9714" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_33FB445D55952E7B7692A4D594BEE666" xlink:to="loc_atvi_BlizzardMember_65C396CCC3311E3C674DA4D594BF9714" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_KingDigitalEntertainmentMember" xlink:label="loc_atvi_KingDigitalEntertainmentMember_FAE114E5BE22C317F24FA4D594C06DBF" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_33FB445D55952E7B7692A4D594BEE666" xlink:to="loc_atvi_KingDigitalEntertainmentMember_FAE114E5BE22C317F24FA4D594C06DBF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CorporateAndOtherMember" xlink:label="loc_us-gaap_CorporateAndOtherMember_F08F645177D2872DEEE9A4D594C0B3FE" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_33FB445D55952E7B7692A4D594BEE666" xlink:to="loc_us-gaap_CorporateAndOtherMember_F08F645177D2872DEEE9A4D594C0B3FE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringCharges" xlink:label="loc_us-gaap_RestructuringCharges_C8AEB6D6A9F256603641A4D594C195D5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_B3DC34A05803DF0A52E0A4D594C005F3" xlink:to="loc_us-gaap_RestructuringCharges_C8AEB6D6A9F256603641A4D594C195D5" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/ScheduleIiValuationAndQualifyingAccounts" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/ScheduleIiValuationAndQualifyingAccountsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ValuationAndQualifyingAccountsDisclosureLineItems" xlink:label="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_A13DCAD56CE92F90F0BB597E25438636" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ValuationAndQualifyingAccountsDisclosureTable" xlink:label="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_85FA935FA7D22DE207C6597E25407A20" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_A13DCAD56CE92F90F0BB597E25438636" xlink:to="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_85FA935FA7D22DE207C6597E25407A20" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ValuationAllowancesAndReservesTypeAxis" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_1723D95C72044327068C597E25407F86" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_85FA935FA7D22DE207C6597E25407A20" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_1723D95C72044327068C597E25407F86" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ValuationAllowancesAndReservesDomain" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDomain_19E1749D38D958F2FCCB597E25414E68_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_1723D95C72044327068C597E25407F86" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDomain_19E1749D38D958F2FCCB597E25414E68_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ValuationAllowancesAndReservesDomain" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDomain_19E1749D38D958F2FCCB597E25414E68" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_1723D95C72044327068C597E25407F86" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDomain_19E1749D38D958F2FCCB597E25414E68" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_AllowanceForSalesReturnsPriceProtectionAndOtherAllowanceMember" xlink:label="loc_atvi_AllowanceForSalesReturnsPriceProtectionAndOtherAllowanceMember_E45B64C112450E542A58597E25416707" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesDomain_19E1749D38D958F2FCCB597E25414E68" xlink:to="loc_atvi_AllowanceForSalesReturnsPriceProtectionAndOtherAllowanceMember_E45B64C112450E542A58597E25416707" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember" xlink:label="loc_us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember_BA035C97066DB0F14CF3597E25433877" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesDomain_19E1749D38D958F2FCCB597E25414E68" xlink:to="loc_us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember_BA035C97066DB0F14CF3597E25433877" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MovementInValuationAllowancesAndReservesRollForward" xlink:label="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_8FF3A4411774EB6930A1597E2543DEAB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_A13DCAD56CE92F90F0BB597E25438636" xlink:to="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_8FF3A4411774EB6930A1597E2543DEAB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ValuationAllowancesAndReservesBalance" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesBalance_B3E6B3CDF366748B4AF1597E2544B0D1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_8FF3A4411774EB6930A1597E2543DEAB" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesBalance_B3E6B3CDF366748B4AF1597E2544B0D1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_3ADF1CD61F503362B8C3597E25443221" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_8FF3A4411774EB6930A1597E2543DEAB" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_3ADF1CD61F503362B8C3597E25443221" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ValuationAllowancesAndReservesDeductions" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDeductions_45ACE0EE8E09264C4EE8597E2544D440" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_8FF3A4411774EB6930A1597E2543DEAB" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDeductions_45ACE0EE8E09264C4EE8597E2544D440" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/ShareBasedPayments" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/ShareBasedPaymentsEquityIncentivePlansDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_94DF14ABA0D9FCB226B33B5C984626F4" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_489196FCD1D28E62739A3B5C98446CEA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_94DF14ABA0D9FCB226B33B5C984626F4" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_489196FCD1D28E62739A3B5C98446CEA" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_F8BD64F462B3E0532C903B5C984489EE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_489196FCD1D28E62739A3B5C98446CEA" xlink:to="loc_us-gaap_AwardTypeAxis_F8BD64F462B3E0532C903B5C984489EE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_A570687644547D3185A43B5C984558C1_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_F8BD64F462B3E0532C903B5C984489EE" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_A570687644547D3185A43B5C984558C1_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_A570687644547D3185A43B5C984558C1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_F8BD64F462B3E0532C903B5C984489EE" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_A570687644547D3185A43B5C984558C1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_2EFBA54E2EA2A3305D7D3B5C9845AF85" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_A570687644547D3185A43B5C984558C1" xlink:to="loc_us-gaap_EmployeeStockOptionMember_2EFBA54E2EA2A3305D7D3B5C9845AF85" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="loc_us-gaap_RestrictedStockMember_0BFD113818E27684ECA53B5C98453943" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_A570687644547D3185A43B5C984558C1" xlink:to="loc_us-gaap_RestrictedStockMember_0BFD113818E27684ECA53B5C98453943" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_D49A5C9B081A35B0B5F63B5C98457145" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_489196FCD1D28E62739A3B5C98446CEA" xlink:to="loc_srt_RangeAxis_D49A5C9B081A35B0B5F63B5C98457145" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_E1B27EF8603816260C4C3B5C98454A6A_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_D49A5C9B081A35B0B5F63B5C98457145" xlink:to="loc_srt_RangeMember_E1B27EF8603816260C4C3B5C98454A6A_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_E1B27EF8603816260C4C3B5C98454A6A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_D49A5C9B081A35B0B5F63B5C98457145" xlink:to="loc_srt_RangeMember_E1B27EF8603816260C4C3B5C98454A6A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_746D96C6D7775D101F973B5C984634F8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_E1B27EF8603816260C4C3B5C98454A6A" xlink:to="loc_srt_MinimumMember_746D96C6D7775D101F973B5C984634F8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_71250803E2C6EB5F5DD73B5C98460518" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_E1B27EF8603816260C4C3B5C98454A6A" xlink:to="loc_srt_MaximumMember_71250803E2C6EB5F5DD73B5C98460518" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_44AC8583B68229618CF33B5C9846D105" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_94DF14ABA0D9FCB226B33B5C984626F4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_44AC8583B68229618CF33B5C9846D105" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_76B7122BD569626DC1213B5C984758ED" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_94DF14ABA0D9FCB226B33B5C984626F4" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_76B7122BD569626DC1213B5C984758ED" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_BE12B7E28DD674C36E9F3B5C98476C09" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_94DF14ABA0D9FCB226B33B5C984626F4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_BE12B7E28DD674C36E9F3B5C98476C09" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance" xlink:label="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_FF4B34AA5B680E95621C3B5C9847942B" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_94DF14ABA0D9FCB226B33B5C984626F4" xlink:to="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_FF4B34AA5B680E95621C3B5C9847942B" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/ShareBasedPaymentsMethodAndAssumptionsOnValuationOfStockOptionsAndAwardsDetails" xlink:type="extended">
    <link:loc xlink:href="atvi-20191231.xsd#atvi_ScheduleofSharebasedCompensationAssumptionsLineItems" xlink:label="loc_atvi_ScheduleofSharebasedCompensationAssumptionsLineItems_700546B895649F10F1753B5C983E4D4A" xlink:type="locator" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_ScheduleofSharebasedCompensationAssumptionsTable" xlink:label="loc_atvi_ScheduleofSharebasedCompensationAssumptionsTable_55956931EDD96F90A5833B5C983D8026" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_atvi_ScheduleofSharebasedCompensationAssumptionsLineItems_700546B895649F10F1753B5C983E4D4A" xlink:to="loc_atvi_ScheduleofSharebasedCompensationAssumptionsTable_55956931EDD96F90A5833B5C983D8026" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_1B082BE82D02E89D967D3B5C983D5B88" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_atvi_ScheduleofSharebasedCompensationAssumptionsTable_55956931EDD96F90A5833B5C983D8026" xlink:to="loc_us-gaap_AwardTypeAxis_1B082BE82D02E89D967D3B5C983D5B88" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0E43088A11E078765F983B5C983DB50D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_1B082BE82D02E89D967D3B5C983D5B88" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0E43088A11E078765F983B5C983DB50D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0E43088A11E078765F983B5C983DB50D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_1B082BE82D02E89D967D3B5C983D5B88" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0E43088A11E078765F983B5C983DB50D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_A2870AC8193A2A1FA56F3B5C983D635A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0E43088A11E078765F983B5C983DB50D" xlink:to="loc_us-gaap_EmployeeStockOptionMember_A2870AC8193A2A1FA56F3B5C983D635A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_268AA1B3F9BCAF91CDEC3B5C983E0064" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_ScheduleofSharebasedCompensationAssumptionsLineItems_700546B895649F10F1753B5C983E4D4A" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_268AA1B3F9BCAF91CDEC3B5C983E0064" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate_35F0204864ECB13FB7993B5C983EE926" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_ScheduleofSharebasedCompensationAssumptionsLineItems_700546B895649F10F1753B5C983E4D4A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate_35F0204864ECB13FB7993B5C983EE926" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_FDD14BD5ED9A8D465C763B5C983E0568" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_ScheduleofSharebasedCompensationAssumptionsLineItems_700546B895649F10F1753B5C983E4D4A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_FDD14BD5ED9A8D465C763B5C983E0568" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_BCADBF6BFD8A14199A013B5C983ED275" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_ScheduleofSharebasedCompensationAssumptionsLineItems_700546B895649F10F1753B5C983E4D4A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_BCADBF6BFD8A14199A013B5C983ED275" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_9C24F5AAE806027682B13B5C983F16B2" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_ScheduleofSharebasedCompensationAssumptionsLineItems_700546B895649F10F1753B5C983E4D4A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_9C24F5AAE806027682B13B5C983F16B2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_58CA4CC31DD16D7B4CEB3B5C983FBD1E" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_ScheduleofSharebasedCompensationAssumptionsLineItems_700546B895649F10F1753B5C983E4D4A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_58CA4CC31DD16D7B4CEB3B5C983FBD1E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_B94A359ECBB3239FABB63B5C983FA22E" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_ScheduleofSharebasedCompensationAssumptionsLineItems_700546B895649F10F1753B5C983E4D4A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_B94A359ECBB3239FABB63B5C983FA22E" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/ShareBasedPaymentsRestrictedStockUnitsAndRestrictedStockAwardsActivitiesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_165F5C19232CC0BFDB463B5C97EF0D37" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_55F1CCD7A4E742C318923B5C97ED4435" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_165F5C19232CC0BFDB463B5C97EF0D37" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_55F1CCD7A4E742C318923B5C97ED4435" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_74CD39BDBE93EE6733803B5C97EE5FAF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_55F1CCD7A4E742C318923B5C97ED4435" xlink:to="loc_us-gaap_AwardTypeAxis_74CD39BDBE93EE6733803B5C97EE5FAF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_E8C9DDBBCDD9CB3011303B5C97EE0776_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_74CD39BDBE93EE6733803B5C97EE5FAF" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_E8C9DDBBCDD9CB3011303B5C97EE0776_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_E8C9DDBBCDD9CB3011303B5C97EE0776" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_74CD39BDBE93EE6733803B5C97EE5FAF" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_E8C9DDBBCDD9CB3011303B5C97EE0776" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="loc_us-gaap_RestrictedStockMember_E162DA775F40119CC89D3B5C97EE7F7E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_E8C9DDBBCDD9CB3011303B5C97EE0776" xlink:to="loc_us-gaap_RestrictedStockMember_E162DA775F40119CC89D3B5C97EE7F7E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PerformanceSharesMember" xlink:label="loc_us-gaap_PerformanceSharesMember_B1794532B294A3339D9C3B5C97EF7F50" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_E8C9DDBBCDD9CB3011303B5C97EE0776" xlink:to="loc_us-gaap_PerformanceSharesMember_B1794532B294A3339D9C3B5C97EF7F50" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_EmployeeStockOptionAndRestrictedStockMember" xlink:label="loc_atvi_EmployeeStockOptionAndRestrictedStockMember_7BF6FDA17EA192D0031B3B5C97EFBCCD" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_E8C9DDBBCDD9CB3011303B5C97EE0776" xlink:to="loc_atvi_EmployeeStockOptionAndRestrictedStockMember_7BF6FDA17EA192D0031B3B5C97EFBCCD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_0307B51CEB6EB77D7CDE3B5C97EFB1D3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_165F5C19232CC0BFDB463B5C97EF0D37" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_0307B51CEB6EB77D7CDE3B5C97EFB1D3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_A17C90D036B265ED8C6E3B5C97EFF060" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_0307B51CEB6EB77D7CDE3B5C97EFB1D3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_A17C90D036B265ED8C6E3B5C97EFF060" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_63C2DA794F32CAE878DD3B5C97F0F588" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_0307B51CEB6EB77D7CDE3B5C97EFB1D3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_63C2DA794F32CAE878DD3B5C97F0F588" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_24200CE40ECD1660E0403B5C97F00137" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_0307B51CEB6EB77D7CDE3B5C97EFB1D3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_24200CE40ECD1660E0403B5C97F00137" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_88D56FC4F2269FD4ED993B5C97F04B2A" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_0307B51CEB6EB77D7CDE3B5C97EFB1D3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_88D56FC4F2269FD4ED993B5C97F04B2A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_ACDF177933F849E5674C3B5C97F0A2AD" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_165F5C19232CC0BFDB463B5C97EF0D37" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_ACDF177933F849E5674C3B5C97F0A2AD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_CF2C6B0A9D0F44EAC67D3B5C97F172C3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_ACDF177933F849E5674C3B5C97F0A2AD" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_CF2C6B0A9D0F44EAC67D3B5C97F172C3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_AED12BA64353C856FCCE3B5C97F1E604" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_ACDF177933F849E5674C3B5C97F0A2AD" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_AED12BA64353C856FCCE3B5C97F1E604" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_950012A70C4DF6D074553B5C97F1A058" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_ACDF177933F849E5674C3B5C97F0A2AD" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_950012A70C4DF6D074553B5C97F1A058" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_90416D213318826C7FC43B5C97F16298" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_ACDF177933F849E5674C3B5C97F0A2AD" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_90416D213318826C7FC43B5C97F16298" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationNotYetRecognizedShareBasedAwardsOtherThanOptionsGrantedWithoutGrantDate" xlink:label="loc_atvi_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationNotYetRecognizedShareBasedAwardsOtherThanOptionsGrantedWithoutGrantDate_8854D1520BF7A159FF9F3B5C97F20183" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_165F5C19232CC0BFDB463B5C97EF0D37" xlink:to="loc_atvi_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationNotYetRecognizedShareBasedAwardsOtherThanOptionsGrantedWithoutGrantDate_8854D1520BF7A159FF9F3B5C97F20183" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationNotYetRecognizedShareBasedAwardsOtherThanOptionsGrantedButNotAccountedFor" xlink:label="loc_atvi_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationNotYetRecognizedShareBasedAwardsOtherThanOptionsGrantedButNotAccountedFor_1156B78863603D7B23FA3B5C97F2A632" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_165F5C19232CC0BFDB463B5C97EF0D37" xlink:to="loc_atvi_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationNotYetRecognizedShareBasedAwardsOtherThanOptionsGrantedButNotAccountedFor_1156B78863603D7B23FA3B5C97F2A632" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_4194FA8812DBE7297BE93B5C97F26ADC" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_165F5C19232CC0BFDB463B5C97EF0D37" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_4194FA8812DBE7297BE93B5C97F26ADC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_22D7646BE90922DB1DB53B5C97F2DF90" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_165F5C19232CC0BFDB463B5C97EF0D37" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_22D7646BE90922DB1DB53B5C97F2DF90" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_F6CE742E34A844A2B9483B5C97F2C8C9" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_165F5C19232CC0BFDB463B5C97EF0D37" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_F6CE742E34A844A2B9483B5C97F2C8C9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromExerciseOfStockOptions" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromExerciseOfStockOptions_5151A8CD970B13AE4D083B5C97F2A68C" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_165F5C19232CC0BFDB463B5C97EF0D37" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromExerciseOfStockOptions_5151A8CD970B13AE4D083B5C97F2A68C" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/ShareBasedPaymentsStockBasedCompensationExpenseDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_5920F7AEFAFB2C7482EE3B5C97E73C72" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_81BEEBE2FEFCBBD2E10C3B5C97E529DD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_5920F7AEFAFB2C7482EE3B5C97E73C72" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_81BEEBE2FEFCBBD2E10C3B5C97E529DD" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_03B91843E94E100459563B5C97E618F2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_81BEEBE2FEFCBBD2E10C3B5C97E529DD" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_03B91843E94E100459563B5C97E618F2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_F19732F9527D83A617DC3B5C97E6BDD7_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_03B91843E94E100459563B5C97E618F2" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_F19732F9527D83A617DC3B5C97E6BDD7_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_F19732F9527D83A617DC3B5C97E6BDD7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_03B91843E94E100459563B5C97E618F2" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_F19732F9527D83A617DC3B5C97E6BDD7" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_CostofRevenuesProductSalesSoftwareRoyaltiesAmortizationandIntellectualPropertyLicensesMember" xlink:label="loc_atvi_CostofRevenuesProductSalesSoftwareRoyaltiesAmortizationandIntellectualPropertyLicensesMember_2E361F09C6678308BD4C3B5C97E6CD4D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_F19732F9527D83A617DC3B5C97E6BDD7" xlink:to="loc_atvi_CostofRevenuesProductSalesSoftwareRoyaltiesAmortizationandIntellectualPropertyLicensesMember_2E361F09C6678308BD4C3B5C97E6CD4D" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_CostofRevenuesSubscriptionLicensingandOtherGameOperationsandDistributionCostsMember" xlink:label="loc_atvi_CostofRevenuesSubscriptionLicensingandOtherGameOperationsandDistributionCostsMember_D6AAF1014BA402E441C03B5C97E6A201" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_F19732F9527D83A617DC3B5C97E6BDD7" xlink:to="loc_atvi_CostofRevenuesSubscriptionLicensingandOtherGameOperationsandDistributionCostsMember_D6AAF1014BA402E441C03B5C97E6A201" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_CostofRevenuesSubscriptionLicensingandOtherSoftwareRoyaltiesAmortizationandIntellectualPropertyLicensesMember" xlink:label="loc_atvi_CostofRevenuesSubscriptionLicensingandOtherSoftwareRoyaltiesAmortizationandIntellectualPropertyLicensesMember_B3B789A0772163FCA74F3B5C97E7E478" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_F19732F9527D83A617DC3B5C97E6BDD7" xlink:to="loc_atvi_CostofRevenuesSubscriptionLicensingandOtherSoftwareRoyaltiesAmortizationandIntellectualPropertyLicensesMember_B3B789A0772163FCA74F3B5C97E7E478" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_ProductDevelopmentMember" xlink:label="loc_atvi_ProductDevelopmentMember_39AC9C343D875C59D8A43B5C97E776D9" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_F19732F9527D83A617DC3B5C97E6BDD7" xlink:to="loc_atvi_ProductDevelopmentMember_39AC9C343D875C59D8A43B5C97E776D9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SellingAndMarketingExpenseMember" xlink:label="loc_us-gaap_SellingAndMarketingExpenseMember_EC38954A8DEFBAAFC5733B5C97E708DD" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_F19732F9527D83A617DC3B5C97E6BDD7" xlink:to="loc_us-gaap_SellingAndMarketingExpenseMember_EC38954A8DEFBAAFC5733B5C97E708DD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GeneralAndAdministrativeExpenseMember" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpenseMember_CB0178FDA09A570788C83B5C97E7A600" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_F19732F9527D83A617DC3B5C97E6BDD7" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpenseMember_CB0178FDA09A570788C83B5C97E7A600" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_234B8936E52D3E0E96903B5C97E73846" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_5920F7AEFAFB2C7482EE3B5C97E73C72" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_234B8936E52D3E0E96903B5C97E73846" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_6E9A56B748A332865B563B5C97E806F3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_5920F7AEFAFB2C7482EE3B5C97E73C72" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_6E9A56B748A332865B563B5C97E806F3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_7B1D22C024DBB89C27423B5C97E8C0ED" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_5920F7AEFAFB2C7482EE3B5C97E73C72" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_7B1D22C024DBB89C27423B5C97E8C0ED" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/ShareBasedPaymentsStockOptionActivitiesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_28511F231D560C69246A3B5C97FB6E1A" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3A7C69E5810B15BC0E093B5C97FA8C4A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_28511F231D560C69246A3B5C97FB6E1A" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3A7C69E5810B15BC0E093B5C97FA8C4A" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_29DB294E092FEF1DAF0F3B5C97FAE6EE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3A7C69E5810B15BC0E093B5C97FA8C4A" xlink:to="loc_us-gaap_AwardTypeAxis_29DB294E092FEF1DAF0F3B5C97FAE6EE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1A33BF6D63140F60A06A3B5C97FB2336_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_29DB294E092FEF1DAF0F3B5C97FAE6EE" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1A33BF6D63140F60A06A3B5C97FB2336_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1A33BF6D63140F60A06A3B5C97FB2336" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_29DB294E092FEF1DAF0F3B5C97FAE6EE" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1A33BF6D63140F60A06A3B5C97FB2336" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_195A275446D8F0623B303B5C97FB5D58" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1A33BF6D63140F60A06A3B5C97FB2336" xlink:to="loc_us-gaap_EmployeeStockOptionMember_195A275446D8F0623B303B5C97FB5D58" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_18A9476730F948223E9D3B5C97FB9A64" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_28511F231D560C69246A3B5C97FB6E1A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_18A9476730F948223E9D3B5C97FB9A64" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_D1F5CCA0B82EF37CBE4E3B5C97FC6223" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_18A9476730F948223E9D3B5C97FB9A64" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_D1F5CCA0B82EF37CBE4E3B5C97FC6223" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_2E21AD85258A37F67A583B5C97FC9ADB" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_18A9476730F948223E9D3B5C97FB9A64" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_2E21AD85258A37F67A583B5C97FC9ADB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_F13F4B315677D03CDDC63B5C97FC01AF" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_18A9476730F948223E9D3B5C97FB9A64" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_F13F4B315677D03CDDC63B5C97FC01AF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_725C5504115CEA7D12223B5C97FCD77A" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_18A9476730F948223E9D3B5C97FB9A64" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_725C5504115CEA7D12223B5C97FCD77A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod_DE6B7408213F78F916073B5C97FC3E52" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_18A9476730F948223E9D3B5C97FB9A64" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod_DE6B7408213F78F916073B5C97FC3E52" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber_4EC4BF4231E1E581D79A3B5C97FD24E9" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_28511F231D560C69246A3B5C97FB6E1A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber_4EC4BF4231E1E581D79A3B5C97FD24E9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber_892D91642B5976AA09543B5C97FD2572" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_28511F231D560C69246A3B5C97FB6E1A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber_892D91642B5976AA09543B5C97FD2572" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_270502BCD0EEC5CB845C3B5C97FDD0A6" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_28511F231D560C69246A3B5C97FB6E1A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_270502BCD0EEC5CB845C3B5C97FDD0A6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_E4CDC652FC75430D2EF93B5C97FD8A96" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_270502BCD0EEC5CB845C3B5C97FDD0A6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_E4CDC652FC75430D2EF93B5C97FD8A96" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_05569731ACDD9A6FD2DE3B5C97FE869D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_270502BCD0EEC5CB845C3B5C97FDD0A6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_05569731ACDD9A6FD2DE3B5C97FE869D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_4A962B054C9C5A6256063B5C97FE2640" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_270502BCD0EEC5CB845C3B5C97FDD0A6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_4A962B054C9C5A6256063B5C97FE2640" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_E5F0774E5BC5AB4210943B5C97FEF18D" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_270502BCD0EEC5CB845C3B5C97FDD0A6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_E5F0774E5BC5AB4210943B5C97FEF18D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_B7336699C68D750412C63B5C97FE7C86" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_270502BCD0EEC5CB845C3B5C97FDD0A6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_B7336699C68D750412C63B5C97FE7C86" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_83CC6FB3C791699ADF153B5C97FE0488" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_28511F231D560C69246A3B5C97FB6E1A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_83CC6FB3C791699ADF153B5C97FE0488" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_8DE329613780CBB2FEC03B5C97FE26C1" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_28511F231D560C69246A3B5C97FB6E1A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_8DE329613780CBB2FEC03B5C97FE26C1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_7B2E7F036C8833BA16183B5C97FF5670" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_28511F231D560C69246A3B5C97FB6E1A" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_7B2E7F036C8833BA16183B5C97FF5670" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1_9A9C30CAB0D3030C84F73B5C97FFED99" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_28511F231D560C69246A3B5C97FB6E1A" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1_9A9C30CAB0D3030C84F73B5C97FFED99" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_678E37018D41BC0794A43B5C97FFF38D" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_28511F231D560C69246A3B5C97FB6E1A" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_678E37018D41BC0794A43B5C97FFF38D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_2B09F5FF44D9A0D221EB3B5C97FFD84F" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_28511F231D560C69246A3B5C97FB6E1A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_2B09F5FF44D9A0D221EB3B5C97FFD84F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue_85DCBD0DEB4314D37A1E3B5C97FF948E" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_28511F231D560C69246A3B5C97FB6E1A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue_85DCBD0DEB4314D37A1E3B5C97FF948E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_107EEF1714E064A209CB3B5C97FF26C1" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_28511F231D560C69246A3B5C97FB6E1A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_107EEF1714E064A209CB3B5C97FF26C1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_ACC14F94721836C967EA3B5C9800915A" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_28511F231D560C69246A3B5C97FB6E1A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_ACC14F94721836C967EA3B5C9800915A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1_6C9D5924F2E4F991B7B03B5C9800C7C4" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_28511F231D560C69246A3B5C97FB6E1A" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1_6C9D5924F2E4F991B7B03B5C9800C7C4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_43FF8F34D5E8DAB0FD8D3B5C98007B64" xlink:type="locator" />
    <link:definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_28511F231D560C69246A3B5C97FB6E1A" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_43FF8F34D5E8DAB0FD8D3B5C98007B64" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_EE92AD01B016F3D66AD03B5C9800DD4D" xlink:type="locator" />
    <link:definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_28511F231D560C69246A3B5C97FB6E1A" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_EE92AD01B016F3D66AD03B5C9800DD4D" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/ShareBasedPaymentsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/SoftwareDevelopmentAndIntellectualPropertyLicenses" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/SoftwareDevelopmentAndIntellectualPropertyLicensesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/SoftwareDevelopmentAndIntellectualPropertyLicensesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/SummaryOfSignificantAccountingPolicies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/SummaryOfSignificantAccountingPoliciesAdvertisingExpensesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/SummaryOfSignificantAccountingPoliciesDefiniteLivedIntangibleAssetsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/SummaryOfSignificantAccountingPoliciesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems" xlink:label="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_E8970A4B5A944D1A09F38263843AC00F" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable" xlink:label="loc_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable_1300F52D335EB1E035058263842C7842" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_E8970A4B5A944D1A09F38263843AC00F" xlink:to="loc_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable_1300F52D335EB1E035058263842C7842" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis" xlink:label="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis_E13B618CA26A64C17B60825EA62C6DF0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable_1300F52D335EB1E035058263842C7842" xlink:to="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis_E13B618CA26A64C17B60825EA62C6DF0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdjustmentsForErrorCorrectionDomain" xlink:label="loc_us-gaap_AdjustmentsForErrorCorrectionDomain_4E58DC459BD8775EC8AC825EA62DA819_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis_E13B618CA26A64C17B60825EA62C6DF0" xlink:to="loc_us-gaap_AdjustmentsForErrorCorrectionDomain_4E58DC459BD8775EC8AC825EA62DA819_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdjustmentsForErrorCorrectionDomain" xlink:label="loc_us-gaap_AdjustmentsForErrorCorrectionDomain_4E58DC459BD8775EC8AC825EA62DA819" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis_E13B618CA26A64C17B60825EA62C6DF0" xlink:to="loc_us-gaap_AdjustmentsForErrorCorrectionDomain_4E58DC459BD8775EC8AC825EA62DA819" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_InitialRecognitionofGlobalIntangibleLowtaxedIncomeofForeignSubsidiariesMember" xlink:label="loc_atvi_InitialRecognitionofGlobalIntangibleLowtaxedIncomeofForeignSubsidiariesMember_70CBAC6CBACCA8AEDF6D825EA62D2F68" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsForErrorCorrectionDomain_4E58DC459BD8775EC8AC825EA62DA819" xlink:to="loc_atvi_InitialRecognitionofGlobalIntangibleLowtaxedIncomeofForeignSubsidiariesMember_70CBAC6CBACCA8AEDF6D825EA62D2F68" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_EC583C3FC725506AF080825EA6350850" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_E8970A4B5A944D1A09F38263843AC00F" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_EC583C3FC725506AF080825EA6350850" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_CapitalizedSoftwareDevelopmentCostsLineItems" xlink:label="loc_atvi_CapitalizedSoftwareDevelopmentCostsLineItems_2C07EDAE8EB1DE8B9A41825EA62B4311" xlink:type="locator" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_CapitalizedSoftwareDevelopmentCostsTable" xlink:label="loc_atvi_CapitalizedSoftwareDevelopmentCostsTable_52888BE8D514CE3DFB3B825EA62AECCF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_atvi_CapitalizedSoftwareDevelopmentCostsLineItems_2C07EDAE8EB1DE8B9A41825EA62B4311" xlink:to="loc_atvi_CapitalizedSoftwareDevelopmentCostsTable_52888BE8D514CE3DFB3B825EA62AECCF" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_ACEABF55757DCFA5D700825EA62BCDBA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_atvi_CapitalizedSoftwareDevelopmentCostsTable_52888BE8D514CE3DFB3B825EA62AECCF" xlink:to="loc_srt_RangeAxis_ACEABF55757DCFA5D700825EA62BCDBA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_FE8558B1AEB743B21C39825EA62B8FB2_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_ACEABF55757DCFA5D700825EA62BCDBA" xlink:to="loc_srt_RangeMember_FE8558B1AEB743B21C39825EA62B8FB2_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_FE8558B1AEB743B21C39825EA62B8FB2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_ACEABF55757DCFA5D700825EA62BCDBA" xlink:to="loc_srt_RangeMember_FE8558B1AEB743B21C39825EA62B8FB2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_140E014E19071ACC39AD825EA62BA880" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_FE8558B1AEB743B21C39825EA62B8FB2" xlink:to="loc_srt_MinimumMember_140E014E19071ACC39AD825EA62BA880" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_C7AADF15F164347719EB825EA62B5F5D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_FE8558B1AEB743B21C39825EA62B8FB2" xlink:to="loc_srt_MaximumMember_C7AADF15F164347719EB825EA62B5F5D" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_CapitalizedSoftwareDevelopmentCostsAmortizationPeriod" xlink:label="loc_atvi_CapitalizedSoftwareDevelopmentCostsAmortizationPeriod_72A3D4A927895EE0880F825EA62CEBE9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_CapitalizedSoftwareDevelopmentCostsLineItems_2C07EDAE8EB1DE8B9A41825EA62B4311" xlink:to="loc_atvi_CapitalizedSoftwareDevelopmentCostsAmortizationPeriod_72A3D4A927895EE0880F825EA62CEBE9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskLineItems" xlink:label="loc_us-gaap_ConcentrationRiskLineItems_A7D662820CEBEC4E2637825EA6347481" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskTable" xlink:label="loc_us-gaap_ConcentrationRiskTable_7775062EDC1F5735DF45825EA62C7C8C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_A7D662820CEBEC4E2637825EA6347481" xlink:to="loc_us-gaap_ConcentrationRiskTable_7775062EDC1F5735DF45825EA62C7C8C" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MajorCustomersAxis" xlink:label="loc_srt_MajorCustomersAxis_5D524F4688C9F0928609825EA62D3751" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_7775062EDC1F5735DF45825EA62C7C8C" xlink:to="loc_srt_MajorCustomersAxis_5D524F4688C9F0928609825EA62D3751" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_NameOfMajorCustomerDomain" xlink:label="loc_srt_NameOfMajorCustomerDomain_2C48740FC35DA531F188825EA62EEB89_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_5D524F4688C9F0928609825EA62D3751" xlink:to="loc_srt_NameOfMajorCustomerDomain_2C48740FC35DA531F188825EA62EEB89_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_NameOfMajorCustomerDomain" xlink:label="loc_srt_NameOfMajorCustomerDomain_2C48740FC35DA531F188825EA62EEB89" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_5D524F4688C9F0928609825EA62D3751" xlink:to="loc_srt_NameOfMajorCustomerDomain_2C48740FC35DA531F188825EA62EEB89" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_AppleMember" xlink:label="loc_atvi_AppleMember_8BC80E432EDB7BEE1986825EA62EC732" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_2C48740FC35DA531F188825EA62EEB89" xlink:to="loc_atvi_AppleMember_8BC80E432EDB7BEE1986825EA62EC732" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_SonyMember" xlink:label="loc_atvi_SonyMember_115BF27B10011BA9E531825EA62E3307" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_2C48740FC35DA531F188825EA62EEB89" xlink:to="loc_atvi_SonyMember_115BF27B10011BA9E531825EA62E3307" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_GoogleMember" xlink:label="loc_atvi_GoogleMember_848EE290B960D8F4ADFB825EA62F829C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_2C48740FC35DA531F188825EA62EEB89" xlink:to="loc_atvi_GoogleMember_848EE290B960D8F4ADFB825EA62F829C" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_NetEaseMember" xlink:label="loc_atvi_NetEaseMember_C967AC3B694BC68D2885825EA62FE460" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_2C48740FC35DA531F188825EA62EEB89" xlink:to="loc_atvi_NetEaseMember_C967AC3B694BC68D2885825EA62FE460" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_MicrosoftMember" xlink:label="loc_atvi_MicrosoftMember_D3DC1741FC41AF0420B1825EA62FFB6F" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_2C48740FC35DA531F188825EA62EEB89" xlink:to="loc_atvi_MicrosoftMember_D3DC1741FC41AF0420B1825EA62FFB6F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_B1E1233969F095194C8F825EA62FF619" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_7775062EDC1F5735DF45825EA62C7C8C" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_B1E1233969F095194C8F825EA62FF619" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_082FEF4FF929C30BB09F825EA634264B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_B1E1233969F095194C8F825EA62FF619" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_082FEF4FF929C30BB09F825EA634264B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_082FEF4FF929C30BB09F825EA634264B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_B1E1233969F095194C8F825EA62FF619" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_082FEF4FF929C30BB09F825EA634264B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerProductAndServiceBenchmarkMember" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerProductAndServiceBenchmarkMember_4B8B7FDC772C40088BDF825EA6344DBB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_082FEF4FF929C30BB09F825EA634264B" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerProductAndServiceBenchmarkMember_4B8B7FDC772C40088BDF825EA6344DBB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsReceivableMember" xlink:label="loc_us-gaap_AccountsReceivableMember_BE33173E502F0BAD5116825EA634C9BD" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_082FEF4FF929C30BB09F825EA634264B" xlink:to="loc_us-gaap_AccountsReceivableMember_BE33173E502F0BAD5116825EA634C9BD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskPercentage1" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_D177F718B466274F4359825EA6355349" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_A7D662820CEBEC4E2637825EA6347481" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_D177F718B466274F4359825EA6355349" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/SummaryOfSignificantAccountingPoliciesEstimatedServicePeriodDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/SummaryOfSignificantAccountingPoliciesGoodwillAndOtherIndefiniteLivedAssetsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_D6ACB897C801D0A630FAA4A828A23661" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable" xlink:label="loc_us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable_D3147C4441CB15103A22A4A828A2CCAC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_D6ACB897C801D0A630FAA4A828A23661" xlink:to="loc_us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable_D3147C4441CB15103A22A4A828A2CCAC" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_A98F1F2B480A50D2290CA4A828A28A93" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable_D3147C4441CB15103A22A4A828A2CCAC" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_A98F1F2B480A50D2290CA4A828A28A93" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_9137E1038731824B2695A4A828A230BE_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_A98F1F2B480A50D2290CA4A828A28A93" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_9137E1038731824B2695A4A828A230BE_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_9137E1038731824B2695A4A828A230BE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_A98F1F2B480A50D2290CA4A828A28A93" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_9137E1038731824B2695A4A828A230BE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TradeNamesMember" xlink:label="loc_us-gaap_TradeNamesMember_EC4C72A098A9E45F1C27A4A828A2A7A8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_9137E1038731824B2695A4A828A230BE" xlink:to="loc_us-gaap_TradeNamesMember_EC4C72A098A9E45F1C27A4A828A2A7A8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillImpairmentLoss" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_A78C3228613F7ADB765AA4A828A2B49A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_D6ACB897C801D0A630FAA4A828A23661" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_A78C3228613F7ADB765AA4A828A2B49A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill" xlink:label="loc_us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill_5D5D537980D5CAE3E6DDA4A828A2D4E7" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_D6ACB897C801D0A630FAA4A828A23661" xlink:to="loc_us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill_5D5D537980D5CAE3E6DDA4A828A2D4E7" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/SummaryOfSignificantAccountingPoliciesLongLivedAssetsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_3A8DC43DCA113BD9FC09A4A82A38620B" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_9163034C6CB115166344A4A82A387DFF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_3A8DC43DCA113BD9FC09A4A82A38620B" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_9163034C6CB115166344A4A82A387DFF" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_A8480D88359A932572ACA4A82A381A51" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_9163034C6CB115166344A4A82A387DFF" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_A8480D88359A932572ACA4A82A381A51" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_31DFBDF1D59A13D060A6A4A82A386E2A_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_A8480D88359A932572ACA4A82A381A51" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_31DFBDF1D59A13D060A6A4A82A386E2A_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_31DFBDF1D59A13D060A6A4A82A386E2A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_A8480D88359A932572ACA4A82A381A51" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_31DFBDF1D59A13D060A6A4A82A386E2A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BuildingMember" xlink:label="loc_us-gaap_BuildingMember_CD39116BB3C3E5FD3663A4A82A381B45" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_31DFBDF1D59A13D060A6A4A82A386E2A" xlink:to="loc_us-gaap_BuildingMember_CD39116BB3C3E5FD3663A4A82A381B45" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ComputerEquipmentMember" xlink:label="loc_us-gaap_ComputerEquipmentMember_8FAB22088FEF1A0D8986A4A82A3824A6" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_31DFBDF1D59A13D060A6A4A82A386E2A" xlink:to="loc_us-gaap_ComputerEquipmentMember_8FAB22088FEF1A0D8986A4A82A3824A6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OfficeEquipmentMember" xlink:label="loc_us-gaap_OfficeEquipmentMember_C49213A4D5A32DBF2B8DA4A82A385F12" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_31DFBDF1D59A13D060A6A4A82A386E2A" xlink:to="loc_us-gaap_OfficeEquipmentMember_C49213A4D5A32DBF2B8DA4A82A385F12" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_D0049F211A65656092E8A4A82A388C3A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_9163034C6CB115166344A4A82A387DFF" xlink:to="loc_srt_RangeAxis_D0049F211A65656092E8A4A82A388C3A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_6BD3CB66D19868B39834A4A82A38BA98_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_D0049F211A65656092E8A4A82A388C3A" xlink:to="loc_srt_RangeMember_6BD3CB66D19868B39834A4A82A38BA98_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_6BD3CB66D19868B39834A4A82A38BA98" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_D0049F211A65656092E8A4A82A388C3A" xlink:to="loc_srt_RangeMember_6BD3CB66D19868B39834A4A82A38BA98" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_343C770795DC7BBE4771A4A82A3816FB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_6BD3CB66D19868B39834A4A82A38BA98" xlink:to="loc_srt_MinimumMember_343C770795DC7BBE4771A4A82A3816FB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_30578E59FEB9B2719A8FA4A82A386F59" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_6BD3CB66D19868B39834A4A82A38BA98" xlink:to="loc_srt_MaximumMember_30578E59FEB9B2719A8FA4A82A386F59" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_A1DA79BB683206995E88A4A82A3800AD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_3A8DC43DCA113BD9FC09A4A82A38620B" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_A1DA79BB683206995E88A4A82A3800AD" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/SummaryOfSignificantAccountingPoliciesPolicies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/SummaryOfSignificantAccountingPoliciesRevenueRecognitionDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_FC7C17916AEF355186AAA4A8290F94FF" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisaggregationOfRevenueTable" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_720FF8E22424207562E5A4A8290F2C59" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_FC7C17916AEF355186AAA4A8290F94FF" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_720FF8E22424207562E5A4A8290F2C59" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_520CD704739335DE01F5A4A8290FA5D3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_720FF8E22424207562E5A4A8290F2C59" xlink:to="loc_srt_RangeAxis_520CD704739335DE01F5A4A8290FA5D3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_861DC15373DF0248F25CA4A8290FE575_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_520CD704739335DE01F5A4A8290FA5D3" xlink:to="loc_srt_RangeMember_861DC15373DF0248F25CA4A8290FE575_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_861DC15373DF0248F25CA4A8290FE575" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_520CD704739335DE01F5A4A8290FA5D3" xlink:to="loc_srt_RangeMember_861DC15373DF0248F25CA4A8290FE575" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_00E0CC0269E5052116ADA4A8290F55F0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_861DC15373DF0248F25CA4A8290FE575" xlink:to="loc_srt_MinimumMember_00E0CC0269E5052116ADA4A8290F55F0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_5C6E2E2D7A3039DCF5B5A4A8290FDE99" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_861DC15373DF0248F25CA4A8290FE575" xlink:to="loc_srt_MaximumMember_5C6E2E2D7A3039DCF5B5A4A8290FDE99" xlink:type="arc" />
    <link:loc xlink:href="atvi-20191231.xsd#atvi_RequirementofPaymentTerm" xlink:label="loc_atvi_RequirementofPaymentTerm_FA34A2C5ED3E1945EB3AA4A8290FAAD8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_FC7C17916AEF355186AAA4A8290F94FF" xlink:to="loc_atvi_RequirementofPaymentTerm_FA34A2C5ED3E1945EB3AA4A8290FAAD8" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.activision.com/role/SupplementalCashFlowInformation" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/SupplementalCashFlowInformationDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.activision.com/role/SupplementalCashFlowInformationTables" xlink:type="extended" />
</link:linkbase>
