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      <flags>
        <overrideInternetFlag>false</overrideInternetFlag>
        <confirmingCopyFlag>false</confirmingCopyFlag>
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      <investmentCompanyType>N-1A</investmentCompanyType>
      <periodOfReport>06/30/2024</periodOfReport>
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          <!--Field: Pseudo-Tag; ID: Series Name; Data: MFS Inflation%2DAdjusted Bond Portfolio-->
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            <!--Field: Pseudo-Tag; ID: Class Name; Data: Initial Class-->
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          <!--Field: Pseudo-Tag; ID: Series Name; Data: MFS Limited Maturity Portfolio-->
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          <!--Field: Pseudo-Tag; ID: Series Name; Data: MFS Conservative Allocation Portfolio-->
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      <yearOrQuarter>YEAR</yearOrQuarter>
      <reportCalendarYear>2024</reportCalendarYear>
      <reportingPerson>
        <name>MFS VARIABLE INSURANCE TRUST III</name>
        <phoneNumber>617-954-5000</phoneNumber>
        <address>
          <com:street1>111 HUNTINGTON AVENUE</com:street1>
          <com:street2>21ST FLOOR</com:street2>
          <com:city>BOSTON</com:city>
          <com:stateOrCountry>MA</com:stateOrCountry>
          <com:zipCode>02199</com:zipCode>
        </address>
      </reportingPerson>
      <agentForService>
        <name>Christopher R. Bohane Massachusetts Financial Services Company</name>
        <address>
          <com:street1>111 HUNTINGTON AVENUE</com:street1>
          <com:city>BOSTON</com:city>
          <com:stateOrCountry>MA</com:stateOrCountry>
          <com:zipCode>02199</com:zipCode>
        </address>
      </agentForService>
      <reportInfo>
        <reportType>FUND NOTICE REPORT</reportType>
      </reportInfo>
      <fileNumber>811-08879</fileNumber>
      <leiNumber>549300QPPZUNGK3D0K61</leiNumber>
      <explanatoryInformation>
        <explanatoryChoice>Y</explanatoryChoice>
        <explanatoryNotes>On behalf of MFS Conservative Allocation Portfolio, MFS Growth Allocation Portfolio, MFS Inflation-Adjusted Bond Portfolio, MFS Limited Maturity Portfolio, and MFS Moderate Allocation Portfolio (the "funds"), each a series of MFS Variable Insurance Trust III, there is no proxy voting activity for the funds, as the funds did not hold any votable positions during the reporting period.</explanatoryNotes>
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    </coverPage>
    <seriesPage>
      <seriesCount>5</seriesCount>
      <seriesDetails>
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          <nameOfSeries>MFS Conservative Allocation Portfolio</nameOfSeries>
          <leiOfSeries>549300S8ONCJ2KJ3TE57</leiOfSeries>
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        <seriesReports>
          <idOfSeries>S000023373</idOfSeries>
          <nameOfSeries>MFS Growth Allocation Portfolio</nameOfSeries>
          <leiOfSeries>54930042PRE3Y8FI7E86</leiOfSeries>
        </seriesReports>
        <seriesReports>
          <idOfSeries>S000023378</idOfSeries>
          <nameOfSeries>MFS Inflation-Adjusted Bond Portfolio</nameOfSeries>
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        <seriesReports>
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          <nameOfSeries>MFS Limited Maturity Portfolio</nameOfSeries>
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        <seriesReports>
          <idOfSeries>S000023372</idOfSeries>
          <nameOfSeries>MFS Moderate Allocation Portfolio</nameOfSeries>
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    <signaturePage>
      <reportingPerson>MFS VARIABLE INSURANCE TRUST III</reportingPerson>
      <txSignature>David DiLorenzo</txSignature>
      <txPrintedSignature>David DiLorenzo</txPrintedSignature>
      <txTitle>David DiLorenzo, President and Principal Executive Officer</txTitle>
      <txAsOfDate>08/27/2024</txAsOfDate>
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