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    <submissionType>13F-HR</submissionType>
    <filerInfo>
      <liveTestFlag>LIVE</liveTestFlag>
      <flags>
        <confirmingCopyFlag>false</confirmingCopyFlag>
        <returnCopyFlag>false</returnCopyFlag>
        <overrideInternetFlag>false</overrideInternetFlag>
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      <filer>
        <credentials>
          <cik>0001097362</cik>
          <ccc>XXXXXXXX</ccc>
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      <periodOfReport>09-30-2024</periodOfReport>
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    <coverPage>
      <reportCalendarOrQuarter>09-30-2024</reportCalendarOrQuarter>
      <isAmendment>false</isAmendment>
      <filingManager>
        <name>SUN LIFE FINANCIAL INC</name>
        <address>
          <ns1:street1>Sun Life Assurance CO of Canada</ns1:street1>
          <ns1:street2>One York Street</ns1:street2>
          <ns1:city>Toronto</ns1:city>
          <ns1:stateOrCountry>A6</ns1:stateOrCountry>
          <ns1:zipCode>M5J 0B6</ns1:zipCode>
        </address>
      </filingManager>
      <reportType>13F COMBINATION REPORT</reportType>
      <form13FFileNumber>028-05799</form13FFileNumber>
      <otherManagersInfo>
        <otherManager>
          <cik>0000912938</cik>
          <form13FFileNumber>028-04968</form13FFileNumber>
          <name>MASSACHUSETTS FINANCIAL SERVICES CO /MA/</name>
        </otherManager>
      </otherManagersInfo>
      <provideInfoForInstruction5>N</provideInfoForInstruction5>
    </coverPage>
    <signatureBlock>
      <name>Randolph Brown</name>
      <title>CIO, Sun Life</title>
      <phone>781-416-2297</phone>
      <signature>/s/ Randolph Brown</signature>
      <city>Wellesley Hills</city>
      <stateOrCountry>MA</stateOrCountry>
      <signatureDate>10-23-2024</signatureDate>
    </signatureBlock>
    <summaryPage>
      <otherIncludedManagersCount>3</otherIncludedManagersCount>
      <tableEntryTotal>37</tableEntryTotal>
      <tableValueTotal>1792470</tableValueTotal>
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            <name>SUN LIFE CAPITAL MANAGEMENT (U.S.) LLC</name>
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        <otherManager2>
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            <name>Sun Life Assurance Co of Canada</name>
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        </otherManager2>
        <otherManager2>
          <sequenceNumber>3</sequenceNumber>
          <otherManager>
            <cik>0001513857</cik>
            <form13FFileNumber>028-15882</form13FFileNumber>
            <name>Crescent Capital Group LP</name>
          </otherManager>
        </otherManager2>
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