<?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>IM</registrantType>
      <liveTestFlag>LIVE</liveTestFlag>
      <filer>
        <issuerCredentials>
          <cik>0000312348</cik>
          <ccc>XXXXXXXX</ccc>
        </issuerCredentials>
      </filer>
      <flags>
        <overrideInternetFlag>false</overrideInternetFlag>
        <confirmingCopyFlag>false</confirmingCopyFlag>
      </flags>
      <investmentCompanyType/>
      <periodOfReport>06/30/2026</periodOfReport>
    </filerInfo>
  </headerData>
  <formData>
    <coverPage>
      <yearOrQuarter>YEAR</yearOrQuarter>
      <reportCalendarYear>2026</reportCalendarYear>
      <reportingPerson>
        <name>LOOMIS SAYLES &amp; CO L P</name>
        <phoneNumber>6179602541</phoneNumber>
        <address>
          <com:street1>ONE FINANCIAL CTR</com:street1>
          <com:street2>LEGAL &amp; COMPLIANCE, 5TH FLOOR</com:street2>
          <com:city>BOSTON</com:city>
          <com:stateOrCountry>MA</com:stateOrCountry>
          <com:zipCode>02111</com:zipCode>
        </address>
      </reportingPerson>
      <agentForService>
        <name>Corporation Service Company</name>
        <address>
          <com:street1>251 Little Falls Drive</com:street1>
          <com:city>Wilmington</com:city>
          <com:stateOrCountry>DE</com:stateOrCountry>
          <com:zipCode>19808</com:zipCode>
        </address>
      </agentForService>
      <reportInfo>
        <reportType>INSTITUTIONAL MANAGER VOTING REPORT</reportType>
        <confidentialTreatment>N</confidentialTreatment>
      </reportInfo>
      <fileNumber>028-00398</fileNumber>
      <reportingCrdNumber>105377</reportingCrdNumber>
      <reportingSecFileNumber>801-170</reportingSecFileNumber>
      <leiNumber>JIZPN2RX3UMNOYIDI313</leiNumber>
      <explanatoryInformation>
        <explanatoryChoice>N</explanatoryChoice>
      </explanatoryInformation>
    </coverPage>
    <summaryPage>
      <otherIncludedManagersCount>1</otherIncludedManagersCount>
      <otherManagers2>
        <investmentManagers>
          <serialNo>2</serialNo>
          <form13FFileNumber>028-13087</form13FFileNumber>
          <leiNumber>549300DZZSM2BX1KLV04</leiNumber>
          <name>Loomis Sayles Trust Company</name>
        </investmentManagers>
      </otherManagers2>
    </summaryPage>
    <signaturePage>
      <reportingPerson>LOOMIS SAYLES &amp; CO L P</reportingPerson>
      <txSignature>Jacob Schulz</txSignature>
      <txPrintedSignature>Jacob Schulz</txPrintedSignature>
      <txTitle>Director of Proxy Voting</txTitle>
      <txAsOfDate>08/06/2026</txAsOfDate>
    </signaturePage>
  </formData>
</edgarSubmission>
