<?xml version="1.0" encoding="UTF-8"?>
<edgarSubmission xsi:schemaLocation="http://www.sec.gov/edgar/thirteenffiler eis_13F_Filer.xsd" xmlns="http://www.sec.gov/edgar/thirteenffiler" xmlns:ns1="http://www.sec.gov/edgar/common" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <headerData>
    <submissionType>13F-HR</submissionType>
    <filerInfo>
      <liveTestFlag>LIVE</liveTestFlag>
      <flags>
        <confirmingCopyFlag>false</confirmingCopyFlag>
        <returnCopyFlag>false</returnCopyFlag>
        <overrideInternetFlag>false</overrideInternetFlag>
      </flags>
      <filer>
        <credentials>
          <cik>0001271347</cik>
          <ccc>XXXXXXXX</ccc>
        </credentials>
      </filer>
      <periodOfReport>06-30-2021</periodOfReport>
    </filerInfo>
  </headerData>
  <formData>
    <coverPage>
      <reportCalendarOrQuarter>06-30-2021</reportCalendarOrQuarter>
      <isAmendment>false</isAmendment>
      <filingManager>
        <name>TIFF ADVISORY SERVICES INC</name>
        <address>
          <ns1:street1>170 N. Radnor Chester Road</ns1:street1>
          <ns1:street2>Suite 300</ns1:street2>
          <ns1:city>Radnor</ns1:city>
          <ns1:stateOrCountry>PA</ns1:stateOrCountry>
          <ns1:zipCode>19087</ns1:zipCode>
        </address>
      </filingManager>
      <reportType>13F COMBINATION REPORT</reportType>
      <form13FFileNumber>028-11995</form13FFileNumber>
      <otherManagersInfo>
        <otherManager>
          <cik>0001599814</cik>
          <form13FFileNumber>028-15794</form13FFileNumber>
          <name>Kopernik Global Investors, LLC</name>
        </otherManager>
        <otherManager>
          <cik>0001569205</cik>
          <form13FFileNumber>028-15226</form13FFileNumber>
          <name>Fundsmith LLP</name>
        </otherManager>
        <otherManager>
          <cik>0001483503</cik>
          <form13FFileNumber>028-13681</form13FFileNumber>
          <name>TB Alternative Assets Ltd.</name>
        </otherManager>
        <otherManager>
          <cik>0001167557</cik>
          <form13FFileNumber>028-10120</form13FFileNumber>
          <name>AQR CAPITAL MANAGEMENT LLC</name>
        </otherManager>
        <otherManager>
          <cik>0001845012</cik>
          <form13FFileNumber>028-20619</form13FFileNumber>
          <name>NewGen Asset Management Ltd</name>
        </otherManager>
        <otherManager>
          <cik>0001592413</cik>
          <form13FFileNumber>028-19492</form13FFileNumber>
          <name>Strategy Capital LLC</name>
        </otherManager>
      </otherManagersInfo>
      <provideInfoForInstruction5>N</provideInfoForInstruction5>
    </coverPage>
    <signatureBlock>
      <name>Christian A. Szautner</name>
      <title>Chief Compliance Officer, TIFF Advisory Services, Inc.</title>
      <phone>610-684-8017</phone>
      <signature>/s/ Christian A. Szautner</signature>
      <city>Radnor</city>
      <stateOrCountry>PA</stateOrCountry>
      <signatureDate>08-06-2021</signatureDate>
    </signatureBlock>
    <summaryPage>
      <otherIncludedManagersCount>0</otherIncludedManagersCount>
      <tableEntryTotal>21</tableEntryTotal>
      <tableValueTotal>350873</tableValueTotal>
    </summaryPage>
  </formData>
</edgarSubmission>
