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  <xs:element id="cmcsa_Notes0000PercentDue2026Member" abstract="true" name="Notes0000PercentDue2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_Notes0250PercentDue2029Member" abstract="true" name="Notes0250PercentDue2029Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_FinanceReceivableProgramAxis" abstract="true" name="FinanceReceivableProgramAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="cmcsa_ProceedsFromSalesOfBusinessesAndInvestments" abstract="false" name="ProceedsFromSalesOfBusinessesAndInvestments" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmcsa_MediaSegmentMember" abstract="true" name="MediaSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_OtherIncomeLossNet" abstract="false" name="OtherIncomeLossNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmcsa_ScheduleOfProgrammingAndProductionCostTableTextBlock" abstract="false" name="ScheduleOfProgrammingAndProductionCostTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="cmcsa_NumberOfBusinesses" abstract="false" name="NumberOfBusinesses" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="cmcsa_EntertainmentLicenseAgreementForProgramMaterialIncludingSportsRightsAdvancesAmortizationExpense" abstract="false" name="EntertainmentLicenseAgreementForProgramMaterialIncludingSportsRightsAdvancesAmortizationExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmcsa_ContentLicensingMember" abstract="true" name="ContentLicensingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_AdjustmentsForItemsExcludedFromAdjustedEBITDA" abstract="false" name="AdjustmentsForItemsExcludedFromAdjustedEBITDA" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmcsa_CollateralizedObligationNoncurrent" abstract="false" name="CollateralizedObligationNoncurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmcsa_OtherMember" abstract="true" name="OtherMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_StockIssuedRepurchasedDuringPeriodValue" abstract="false" name="StockIssuedRepurchasedDuringPeriodValue" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmcsa_ComponentsOfInvestmentAndOtherIncomeLossNetTableTextBlock" abstract="false" name="ComponentsOfInvestmentAndOtherIncomeLossNetTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="cmcsa_GainLossOnInvestmentsAndOtherNoncashIncomeLossNet" abstract="false" name="GainLossOnInvestmentsAndOtherNoncashIncomeLossNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmcsa_AccruedParticipationsAndResidualsCurrent" abstract="false" name="AccruedParticipationsAndResidualsCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmcsa_Notes5.50PercentDue2029Member" abstract="true" name="Notes5.50PercentDue2029Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_ContributionsFromDistributionsToNoncontrollingInterests" abstract="false" name="ContributionsFromDistributionsToNoncontrollingInterests" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmcsa_CableCommunicationsSegmentsMember" abstract="true" name="CableCommunicationsSegmentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_BusinessUnitDomain" abstract="true" name="BusinessUnitDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_HuluMember" abstract="true" name="HuluMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_ContributionsFromAndDistributionsToNoncontrollingInterestsAttributableToTemporaryEquity" abstract="false" name="ContributionsFromAndDistributionsToNoncontrollingInterestsAttributableToTemporaryEquity" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmcsa_InvestmentSecuringCollateralizedObligation" abstract="false" name="InvestmentSecuringCollateralizedObligation" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmcsa_GoodwillForeignCurrencyTranslationGainLossAndOther" abstract="false" name="GoodwillForeignCurrencyTranslationGainLossAndOther" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmcsa_FilmMonetizedOnItsOwnCapitalizedCostAndEntertainmentLicenseAgreementForProgramMaterialIncludingSportsRightsAdvances" abstract="false" name="FilmMonetizedOnItsOwnCapitalizedCostAndEntertainmentLicenseAgreementForProgramMaterialIncludingSportsRightsAdvances" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmcsa_ResidentialConnectivityAndPlatformsSegmentMember" abstract="true" name="ResidentialConnectivityAndPlatformsSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_ScheduleOfOtherBalanceSheetAccountsRelatedToRecognitionOfRevenueTableTextBlock" abstract="false" name="ScheduleOfOtherBalanceSheetAccountsRelatedToRecognitionOfRevenueTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="cmcsa_DomesticWirelessMember" abstract="true" name="DomesticWirelessMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_UniversalBeijingResortTermLoansMember" abstract="true" name="UniversalBeijingResortTermLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_DomesticBroadbandMember" abstract="true" name="DomesticBroadbandMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_InternationalNetworksMember" abstract="true" name="InternationalNetworksMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_CollateralizedObligationCurrent" abstract="false" name="CollateralizedObligationCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmcsa_ProceedsFromCollateralizedObligation" abstract="false" name="ProceedsFromCollateralizedObligation" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmcsa_TheatricalMember" abstract="true" name="TheatricalMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_FilmMonetizedOnItsOwnCapitalizedCostInProductionAndInDevelopment" abstract="false" name="FilmMonetizedOnItsOwnCapitalizedCostInProductionAndInDevelopment" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmcsa_BusinessUnitAxis" abstract="true" name="BusinessUnitAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="cmcsa_FilmAndTelevisionContentAbstract" abstract="true" name="FilmAndTelevisionContentAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="cmcsa_FinanceReceivableProgramDomain" abstract="true" name="FinanceReceivableProgramDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_IncreaseDecreaseInFilmAndTelevisionCostNet" abstract="false" name="IncreaseDecreaseInFilmAndTelevisionCostNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmcsa_EquityMethodInvestmentsAndCertainRetainedDistributions" abstract="false" name="EquityMethodInvestmentsAndCertainRetainedDistributions" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmcsa_AdjustedEBITDA" abstract="false" name="AdjustedEBITDA" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmcsa_BusinessServicesConnectivitySegmentMember" abstract="true" name="BusinessServicesConnectivitySegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_AtairosMember" abstract="true" name="AtairosMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_ScheduleOfCapitalizedFilmAndTelevisionCostsTableTextBlock" abstract="false" name="ScheduleOfCapitalizedFilmAndTelevisionCostsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="cmcsa_OtherProgrammingAndProductionExpense" abstract="false" name="OtherProgrammingAndProductionExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmcsa_OtherOperatingAndAdministrative" abstract="false" name="OtherOperatingAndAdministrative" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmcsa_VariableInterestEntityReportingEntityInvolvementUnfundedCapitalCommitment" abstract="false" name="VariableInterestEntityReportingEntityInvolvementUnfundedCapitalCommitment" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmcsa_ShortTermInstrumentsMember" abstract="true" name="ShortTermInstrumentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_VideoMember" abstract="true" name="VideoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_InternationalConnectivityMember" abstract="true" name="InternationalConnectivityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_InterBusinessUnitEliminationsMember" abstract="true" name="InterBusinessUnitEliminationsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_Notes0.750percentdue2032Member" abstract="true" name="Notes0.750percentdue2032Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_NoncashInterestExpenseIncomeNet" abstract="false" name="NoncashInterestExpenseIncomeNet" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmcsa_FilmMonetizedOnItsOwnAndEntertainmentLicenseAgreementForProgramMaterialIncludingSportsRightsAdvancesCapitalizedCostsNoncurrent" abstract="false" name="FilmMonetizedOnItsOwnAndEntertainmentLicenseAgreementForProgramMaterialIncludingSportsRightsAdvancesCapitalizedCostsNoncurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmcsa_StudiosSegmentMember" abstract="true" name="StudiosSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_Notes1.500percentDue2029Member" abstract="true" name="Notes1.500percentDue2029Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_VideoDistributionProgrammingExpense" abstract="false" name="VideoDistributionProgrammingExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmcsa_DomesticDistributionMember" abstract="true" name="DomesticDistributionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_Notes0.250percentDue2027Member" abstract="true" name="Notes0.250percentDue2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_ConnectivityAndPlatformsMember" abstract="true" name="ConnectivityAndPlatformsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_FilmMonetizedOnItsOwnAmortizationExpenseIncludingParticipationsAndResiduals" abstract="false" name="FilmMonetizedOnItsOwnAmortizationExpenseIncludingParticipationsAndResiduals" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmcsa_SkyLimitedSegmentsMember" abstract="true" name="SkyLimitedSegmentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_EntertainmentLicenseAgreementForProgramMaterialIncludingSportsRightsAdvancesCapitalizedCost" abstract="false" name="EntertainmentLicenseAgreementForProgramMaterialIncludingSportsRightsAdvancesCapitalizedCost" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmcsa_ThemeParksSegmentMember" abstract="true" name="ThemeParksSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_ProgrammingAndProductionCosts" abstract="false" name="ProgrammingAndProductionCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmcsa_ExchangeableSubordinatedDebentures2.0PercentDue2029Member" abstract="true" name="ExchangeableSubordinatedDebentures2.0PercentDue2029Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_CorporateNonSegmentIntersegmentRevenueMember" abstract="true" name="CorporateNonSegmentIntersegmentRevenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_DomesticAdvertisementMember" abstract="true" name="DomesticAdvertisementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_Notes1.875percentdue2036Member" abstract="true" name="Notes1.875percentdue2036Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_ManagementGrantMember" abstract="true" name="ManagementGrantMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_Notes1.250percentdue2040Member" abstract="true" name="Notes1.250percentdue2040Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_ResidentialConnectivityMember" abstract="true" name="ResidentialConnectivityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cmcsa_CollateralizedObligationFairValue" abstract="false" name="CollateralizedObligationFairValue" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmcsa_PaymentsForConstructionOfThemePark" abstract="false" name="PaymentsForConstructionOfThemePark" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
</xs:schema>
