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    <isConfidential>false</isConfidential>
    <filerInfo>

      <filer>
        <issuerCredentials>
          <cik>0000899148</cik>
          <ccc>XXXXXXXX</ccc>
        </issuerCredentials>
      </filer>


      <seriesClassInfo>
        <seriesId>S000003774</seriesId>
        <classId>C000010463</classId>
        <classId>C000010464</classId>
        <classId>C000010465</classId>
      </seriesClassInfo>

    </filerInfo>
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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>2021-12-31</repPdEnd>
      <repPdDate>2021-12-31</repPdDate>
      <isFinalFiling>N</isFinalFiling>
    </genInfo>
    <fundInfo>
      <totAssets>22270985.59</totAssets>
      <totLiabs>36196.17</totLiabs>
      <netAssets>22234789.42</netAssets>
      <assetsAttrMiscSec>0.00000000</assetsAttrMiscSec>
      <assetsInvested>3937547.87000000</assetsInvested>
      <amtPayOneYrBanksBorr>0.00000000</amtPayOneYrBanksBorr>
      <amtPayOneYrCtrldComp>0.00000000</amtPayOneYrCtrldComp>
      <amtPayOneYrOthAffil>0.00000000</amtPayOneYrOthAffil>
      <amtPayOneYrOther>0.00000000</amtPayOneYrOther>
      <amtPayAftOneYrBanksBorr>0.00000000</amtPayAftOneYrBanksBorr>
      <amtPayAftOneYrCtrldComp>0.00000000</amtPayAftOneYrCtrldComp>
      <amtPayAftOneYrOthAffil>0.00000000</amtPayAftOneYrOthAffil>
      <amtPayAftOneYrOther>0.00000000</amtPayAftOneYrOther>
      <delayDeliv>0.00000000</delayDeliv>
      <standByCommit>0.00000000</standByCommit>
      <liquidPref>0.00000000</liquidPref>
      <cshNotRptdInCorD>3.99000000</cshNotRptdInCorD>
      <isNonCashCollateral>N</isNonCashCollateral>
      <returnInfo>
        <monthlyTotReturns>
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          <monthlyTotReturn classId="C000010464" rtn1="5.64034400" rtn2="-10.74130600" rtn3="7.30618200"/>
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        <monthlyReturnCats>
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            <futureCategory>
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        <othMon3 netRealizedGain="0.00000000" netUnrealizedAppr="-2326.83000000"/>
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      <invstOrSec>
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        <title>Guggenheim Ultra Short Duration Fund - Institutional Class</title>
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        <fairValLevel>1</fairValLevel>
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      <invstOrSec>
        <name>Chicago Mercantile Exchange</name>
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        <fairValLevel>1</fairValLevel>
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            <descRefInstrmnt>
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        <fairValLevel>2</fairValLevel>
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        <securityLending>
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      <invstOrSec>
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      <invstOrSec>
        <name>TREASURY BILL</name>
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        <fairValLevel>2</fairValLevel>
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      </invstOrSec>
      <invstOrSec>
        <name>BOFA SECURITIES, INC.</name>
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        <fairValLevel>2</fairValLevel>
        <repurchaseAgrmt>
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          <notClearedCentCparty isCleared="N">
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          <isTriParty>Y</isTriParty>
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              <invstCat>UST</invstCat>
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        <securityLending>
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      </invstOrSec>
    </invstOrSecs>
    <signature>
      <ncom:dateSigned>2022-01-31</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>
</edgarSubmission>
