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<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>
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      <filer>
        <credentials>
          <cik>0001630806</cik>
          <ccc>XXXXXXXX</ccc>
        </credentials>
      </filer>
      <periodOfReport>06-30-2018</periodOfReport>
    </filerInfo>
  </headerData>
  <formData>
    <coverPage>
      <reportCalendarOrQuarter>06-30-2018</reportCalendarOrQuarter>
      <isAmendment>false</isAmendment>
      <filingManager>
        <name>Newfound Research LLC</name>
        <address>
          <ns1:street1>425 Boylston Street</ns1:street1>
          <ns1:street2>3rd Fl</ns1:street2>
          <ns1:city>Boston</ns1:city>
          <ns1:stateOrCountry>MA</ns1:stateOrCountry>
          <ns1:zipCode>02116</ns1:zipCode>
        </address>
      </filingManager>
      <reportType>13F HOLDINGS REPORT</reportType>
      <form13FFileNumber>028-17093</form13FFileNumber>
      <provideInfoForInstruction5>Y</provideInfoForInstruction5>
      <additionalInformation>The filing of this report shall not be deemed an admission, for purposes of Section 13(f), 13(d), 13(g), or 16(a) under the Securities Exchange Act of 1934, as amended, and the rules thereunder, or for any other purpose, that the Reporting Manager or any other person (including Other Managers or Other Included Managers named herein) is the beneficial owner of any securities.    Newfound Research LLC, a Delaware limited liability company ("Newfound"), is an institutional investment manager which, for the purposes of Section 13(f) of the Securities Exchange Act of 1934 and the rules promulgated thereunder ("Section 13(f)"), exercises investment discretion with respect to certain securities positions.  Thomas B. Rosedale, an individual ("Rosedale"), Corey M. Hoffstein, an individual ("Hoffstein"), Daniel J. Sibears, an individual ("Sibears"), Newfound Holdings, LLC, a Delaware limited liability company ("Holdings"), and Sand Hill Cove Management LLC, a Delaware limited liability company ("SandHill"), may each be deemed to exercise investment discretion over the securities reported on this Form 13F for purposes of Section 13(f).  Certain of the security positions reported by Newfound are also being reported by Rosedale, Hoffstein, Sibears, Holdings and SandHill.  Each of Newfound, Rosedale, Hoffstein, Sibears, Holdings and SandHill disclaims beneficial ownership of the shares reported on this Form 13F by Newfound except to the extent of any pecuniary interest therein.</additionalInformation>
    </coverPage>
    <signatureBlock>
      <name>Thomas B. Rosedale</name>
      <title>Chief Executive Officer</title>
      <phone>617-531-9773</phone>
      <signature>/s/ Thomas B. Rosedale</signature>
      <city>Boston</city>
      <stateOrCountry>MA</stateOrCountry>
      <signatureDate>07-31-2018</signatureDate>
    </signatureBlock>
    <summaryPage>
      <otherIncludedManagersCount>5</otherIncludedManagersCount>
      <tableEntryTotal>227</tableEntryTotal>
      <tableValueTotal>176893</tableValueTotal>
      <otherManagers2Info>
        <otherManager2>
          <sequenceNumber>1</sequenceNumber>
          <otherManager>
            <cik>0001256731</cik>
            <form13FFileNumber>028-17094</form13FFileNumber>
            <name>Rosedale Thomas B.</name>
          </otherManager>
        </otherManager2>
        <otherManager2>
          <sequenceNumber>2</sequenceNumber>
          <otherManager>
            <cik>0001630803</cik>
            <form13FFileNumber>028-17095</form13FFileNumber>
            <name>Hoffstein Corey</name>
          </otherManager>
        </otherManager2>
        <otherManager2>
          <sequenceNumber>3</sequenceNumber>
          <otherManager>
            <cik>0001664630</cik>
            <form13FFileNumber>028-17096</form13FFileNumber>
            <name>Sibears Daniel J</name>
          </otherManager>
        </otherManager2>
        <otherManager2>
          <sequenceNumber>4</sequenceNumber>
          <otherManager>
            <cik>0001664645</cik>
            <form13FFileNumber>028-17097</form13FFileNumber>
            <name>Sand Hill Cove Management LLC</name>
          </otherManager>
        </otherManager2>
        <otherManager2>
          <sequenceNumber>5</sequenceNumber>
          <otherManager>
            <cik>0001630807</cik>
            <form13FFileNumber>028-17098</form13FFileNumber>
            <name>Newfound Holdings, LLC</name>
          </otherManager>
        </otherManager2>
      </otherManagers2Info>
    </summaryPage>
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