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    <filerInfo>

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          <cik>0000899148</cik>
          <ccc>XXXXXXXX</ccc>
        </issuerCredentials>
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        <classId>C000010465</classId>
        <classId>C000010464</classId>
        <classId>C000010463</classId>
      </seriesClassInfo>

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      <regName>Rydex Series Funds</regName>
      <regFileNumber>811-07584</regFileNumber>
      <regCik>0000899148</regCik>
      <regLei>5493004D62WV1EDNTU07</regLei>
      <regStreet1>702 King Farm Blvd., Suite 200</regStreet1>
      <regCity>Rockville</regCity>
      <regStateConditional regCountry="US" regState="US-MD"/>
      <regZipOrPostalCode>20850</regZipOrPostalCode>
      <regPhone>301-296-5100</regPhone>
      <seriesName>Commodities Strategy Fund</seriesName>
      <seriesId>S000003774</seriesId>
      <seriesLei>549300Y83L5ISW76HS10</seriesLei>
      <repPdEnd>2020-12-31</repPdEnd>
      <repPdDate>2020-03-31</repPdDate>
      <isFinalFiling>N</isFinalFiling>
    </genInfo>
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      <totLiabs>3152.10</totLiabs>
      <netAssets>874205.44</netAssets>
      <assetsAttrMiscSec>0.00000000</assetsAttrMiscSec>
      <assetsInvested>188333.52000000</assetsInvested>
      <amtPayOneYrBanksBorr>0.00000000</amtPayOneYrBanksBorr>
      <amtPayOneYrCtrldComp>0.00000000</amtPayOneYrCtrldComp>
      <amtPayOneYrOthAffil>0.00000000</amtPayOneYrOthAffil>
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      <amtPayAftOneYrBanksBorr>0.00000000</amtPayAftOneYrBanksBorr>
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      <amtPayAftOneYrOther>0.00000000</amtPayAftOneYrOther>
      <delayDeliv>0.00000000</delayDeliv>
      <standByCommit>0.00000000</standByCommit>
      <liquidPref>0.00000000</liquidPref>
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      <isNonCashCollateral>N</isNonCashCollateral>
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            <futureCategory>
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        <fairValLevel>1</fairValLevel>
        <derivativeInfo>
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              <counterpartyLei>FOR8UP27PHTHYVLBNG30</counterpartyLei>
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            <payOffProf>Long</payOffProf>
            <descRefInstrmnt>
              <indexBasketInfo>
                <indexName>S&amp;P GSCI Index Spot CME</indexName>
                <indexIdentifier>SPGSCI</indexIdentifier>
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            </descRefInstrmnt>
            <expDate>2020-04-16</expDate>
            <notionalAmt>1128446.87000000</notionalAmt>
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          <isLoanByFund>N</isLoanByFund>
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      </invstOrSec>
      <invstOrSec>
        <name>BOFA SECURITIES, INC.</name>
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        <fairValLevel>2</fairValLevel>
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        <securityLending>
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      <invstOrSec>
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        <fairValLevel>2</fairValLevel>
        <debtSec>
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          <couponKind>None</couponKind>
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        <fairValLevel>1</fairValLevel>
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        <fairValLevel>1</fairValLevel>
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        <invCountry>US</invCountry>
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        <fairValLevel>2</fairValLevel>
        <repurchaseAgrmt>
          <transCat>Repurchase</transCat>
          <notClearedCentCparty isCleared="N">
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        </securityLending>
      </invstOrSec>
    </invstOrSecs>
    <signature>
      <ncom:dateSigned>2020-04-30</ncom:dateSigned>
      <ncom:nameOfApplicant>Rydex Series Funds</ncom:nameOfApplicant>
      <ncom:signature>John Sullivan</ncom:signature>
      <ncom:signerName>John Sullivan</ncom:signerName>
      <ncom:title>CFO</ncom:title>
    </signature>
  </formData>
  <documents>XXXX</documents>
</edgarSubmission>
