<?xml version="1.0" encoding="US-ASCII" ?>
    <!-- Field: Doc-Info; Name: Generator; Value: GoFiler Complete; Version: 5.22a -->
    <!-- Field: Doc-Info; Name: VendorURI; Value: https://www.novaworks.com -->
    <!-- Field: Doc-Info; Name: Status; Value: 0x00000000 -->
    <!-- Field: Doc-Info; Name: Misc; Value: +qgpw7xRiXhun8uDbnwsOa+EKcPtwZF9eYkxtm90bdl6zyQkgKaA/iyxPoPmAZQE -->
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    <annotation>
      <appinfo>
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          <link:definition>00000001 - Document - Cover</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:linkbaseRef xlink:type="simple" xlink:href="cmcsa-20240610_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:title="Presentation Links" />
        <link:linkbaseRef xlink:type="simple" xlink:href="cmcsa-20240610_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:title="Label Links" />
        <link:linkbaseRef xlink:type="simple" xlink:href="cmcsa-20240610_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:title="Definition Links" />
      </appinfo>
    </annotation>
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    <import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" />
    <import namespace="http://xbrl.sec.gov/dei/2023" schemaLocation="https://xbrl.sec.gov/dei/2023/dei-2023.xsd" />
    <import namespace="http://fasb.org/us-types/2023" schemaLocation="https://xbrl.fasb.org/us-gaap/2023/elts/us-types-2023.xsd" />
    <import namespace="http://www.xbrl.org/dtr/type/2022-03-31" schemaLocation="https://www.xbrl.org/dtr/type/2022-03-31/types.xsd" />
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    <import namespace="http://xbrl.sec.gov/country/2023" schemaLocation="https://xbrl.sec.gov/country/2023/country-2023.xsd" />
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    <element id="cmcsa_PEOPlusFairValueForUnvestedAwardsGrantedInTheCoveredYearMember" name="PEOPlusFairValueForUnvestedAwardsGrantedInTheCoveredYearMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="cmcsa_PEOChangeInFairValueOfOutstandingUnvestedAwardsFromPriorYearsMember" name="PEOChangeInFairValueOfOutstandingUnvestedAwardsFromPriorYearsMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
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    <element id="cmcsa_NonPEONEONetAdjustmentMember" name="NonPEONEONetAdjustmentMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="cmcsa_PEOActuallyPaidCompensationAmountYearOverYearChangePercent" name="PEOActuallyPaidCompensationAmountYearOverYearChangePercent" nillable="true" xbrli:periodType="instant" type="xbrli:pureItemType" substitutionGroup="xbrli:item" />
    <element id="cmcsa_NonPEONEOAverageCompensationActuallyPaidAmountYearOverYearChangePercent" name="NonPEONEOAverageCompensationActuallyPaidAmountYearOverYearChangePercent" nillable="true" xbrli:periodType="instant" type="xbrli:pureItemType" substitutionGroup="xbrli:item" />
    <element id="cmcsa_TotalShareholderReturnAmountYearOverYearChangePercent" name="TotalShareholderReturnAmountYearOverYearChangePercent" nillable="true" xbrli:periodType="instant" type="xbrli:pureItemType" substitutionGroup="xbrli:item" />
    <element id="cmcsa_PeerGroupTotalShareholderReturnAmountYearOverYearChangePercent" name="PeerGroupTotalShareholderReturnAmountYearOverYearChangePercent" nillable="true" xbrli:periodType="instant" type="xbrli:pureItemType" substitutionGroup="xbrli:item" />
    <element id="cmcsa_NetIncomeLossYearOverYearChangePercent" name="NetIncomeLossYearOverYearChangePercent" nillable="true" xbrli:periodType="instant" type="xbrli:pureItemType" substitutionGroup="xbrli:item" />
    <element id="cmcsa_CompanySelectedMeasureAmountYearOverYearChangePercent" name="CompanySelectedMeasureAmountYearOverYearChangePercent" nillable="true" xbrli:periodType="instant" type="xbrli:pureItemType" substitutionGroup="xbrli:item" />
</schema>
