<?xml version="1.0" encoding="UTF-8"?>
<edgarSubmission xmlns="http://www.sec.gov/edgar/npx" xmlns:com="http://www.sec.gov/edgar/common">
  <headerData>
    <submissionType>N-PX</submissionType>
    <filerInfo>
      <registrantType>RMIC</registrantType>
      <liveTestFlag>LIVE</liveTestFlag>
      <filer>
        <issuerCredentials>
          <cik>0000356349</cik>
          <ccc>XXXXXXXX</ccc>
          <!--Field: Pseudo-Tag; ID: Name; Data:-->
        </issuerCredentials>
      </filer>
      <flags>
        <overrideInternetFlag>false</overrideInternetFlag>
        <confirmingCopyFlag>false</confirmingCopyFlag>
      </flags>
      <investmentCompanyType>N-1A</investmentCompanyType>
      <periodOfReport>06/30/2025</periodOfReport>
    </filerInfo>
    <seriesClass>
      <reportSeriesClass>
        <rptIncludeAllSeriesFlag>true</rptIncludeAllSeriesFlag>
      </reportSeriesClass>
    </seriesClass>
  </headerData>
  <formData>
    <coverPage>
      <yearOrQuarter>YEAR</yearOrQuarter>
      <reportCalendarYear>2025</reportCalendarYear>
      <reportingPerson>
        <name>MFS SERIES TRUST XIII</name>
        <phoneNumber>617-954-5000</phoneNumber>
        <address>
          <com:street1>111 Huntington Ave</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>
      <reportInfo>
        <reportType>FUND VOTING REPORT</reportType>
      </reportInfo>
      <fileNumber>811-03327</fileNumber>
      <reportingSecFileNumber>811-03327</reportingSecFileNumber>
      <leiNumber>5493000SCRZM3WD72S74</leiNumber>
      <explanatoryInformation>
        <explanatoryChoice>Y</explanatoryChoice>
        <explanatoryNotes>During the reporting period, MFS Diversified Income Fund, a series of the Registrant, voted at the November 14, 2024 shareholder meeting of the MFS High Yield Pooled Portfolio ("underlying fund"), a series of MFS Series Trust III. To address any potential conflicts of interest on the part of MFS that could arise from MFS voting shares of the underlying fund on behalf of the MFS Diversified Income Fund, MFS voted these shares in the same proportion as the votes cast by shareholders of the other funds that are series of MFS Series Trust III. As a result, the voting record for this meeting will reflect a split vote. Additionally, the amounts in columns 10 and 12 for the unanimous written consent of the shareholders of MFS Series Trust XIV-MFS Institutional Money Market Portfolio reflect dollars of net asset value.</explanatoryNotes>
      </explanatoryInformation>
    </coverPage>
    <summaryPage>
      <otherIncludedManagersCount>0</otherIncludedManagersCount>
    </summaryPage>
    <seriesPage>
      <seriesCount>4</seriesCount>
      <seriesDetails>
        <seriesReports>
          <idOfSeries>S000000693</idOfSeries>
          <nameOfSeries>MFS Government Securities Fund</nameOfSeries>
          <leiOfSeries>UWWK6TDSOPDQSQMMEB12</leiOfSeries>
        </seriesReports>
        <seriesReports>
          <idOfSeries>S000012219</idOfSeries>
          <nameOfSeries>MFS Diversified Income Fund</nameOfSeries>
          <leiOfSeries>7Z555RPCNKK7AVR16U38</leiOfSeries>
        </seriesReports>
        <seriesReports>
          <idOfSeries>S000024971</idOfSeries>
          <nameOfSeries>MFS Global Real Estate Fund</nameOfSeries>
          <leiOfSeries>ROYDM6SL56ZXYAENS860</leiOfSeries>
        </seriesReports>
        <seriesReports>
          <idOfSeries>S000032712</idOfSeries>
          <nameOfSeries>MFS New Discovery Value Fund</nameOfSeries>
          <leiOfSeries>LRMRW30Z8FYTIFW1W860</leiOfSeries>
        </seriesReports>
      </seriesDetails>
    </seriesPage>
    <signaturePage>
      <reportingPerson>MFS SERIES TRUST XIII</reportingPerson>
      <txSignature>David DiLorenzo</txSignature>
      <txPrintedSignature>David DiLorenzo</txPrintedSignature>
      <txTitle>President and Principal Executive Officer</txTitle>
      <txAsOfDate>08/28/2025</txAsOfDate>
    </signaturePage>
  </formData>
</edgarSubmission>
