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<edgarSubmission xmlns="http://www.sec.gov/edgar/thirteenffiler" xmlns:com="http://www.sec.gov/edgar/common">
  <headerData>
    <submissionType>13F-NT</submissionType>
    <filerInfo>
      <liveTestFlag>LIVE</liveTestFlag>
      <flags>
        <confirmingCopyFlag>false</confirmingCopyFlag>
        <returnCopyFlag>true</returnCopyFlag>
        <overrideInternetFlag>false</overrideInternetFlag>
      </flags>
      <filer>
        <credentials>
          <cik>0001687163</cik>
          <ccc>XXXXXXXX</ccc>
        </credentials>
      </filer>
      <periodOfReport>09-30-2019</periodOfReport>
    </filerInfo>
  </headerData>
  <formData>
    <coverPage>
      <reportCalendarOrQuarter>09-30-2019</reportCalendarOrQuarter>
      <filingManager>
        <name>Yorktown XI Associates LLC</name>
        <address>
          <com:street1>410 PARK AVENUE</com:street1>
          <com:street2>19TH FLOOR</com:street2>
          <com:city>NEW YORK</com:city>
          <com:stateOrCountry>NY</com:stateOrCountry>
          <com:zipCode>10022</com:zipCode>
        </address>
      </filingManager>
      <reportType>13F NOTICE</reportType>
      <form13FFileNumber>028-17865</form13FFileNumber>
      <otherManagersInfo>
        <otherManager>
          <cik>0001667954</cik>
          <form13FFileNumber>028-17860</form13FFileNumber>
          <name>Yorktown Energy Partners XI, L.P.</name>
        </otherManager>
        <otherManager>
          <cik>0001698089</cik>
          <form13FFileNumber>028-17928</form13FFileNumber>
          <name>Yorktown XI Co LP</name>
        </otherManager>
      </otherManagersInfo>
      <provideInfoForInstruction5>Y</provideInfoForInstruction5>
      <additionalInformation>Yorktown XI Company LP is the sole general partner of Yorktown Energy Partners XI, L.P. Yorktown XI Associates LLC is the sole general partner of Yorktown XI Company LP. As a result, Yorktown XI Associates LLC may be deemed to have the power to vote or direct the vote or to dispose or direct the disposition of the shares owned by Yorktown Energy Partners XI, L.P.</additionalInformation>
    </coverPage>
    <signatureBlock>
      <name>Bryan H. Lawrence</name>
      <title>Managing Member</title>
      <phone>212-515-2112</phone>
      <signature>/s/ Bryan H. Lawrence</signature>
      <city>New York</city>
      <stateOrCountry>NY</stateOrCountry>
      <signatureDate>11-14-2019</signatureDate>
    </signatureBlock>
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