<SEC-DOCUMENT>0001169561-23-000056.txt : 20230517
<SEC-HEADER>0001169561-23-000056.hdr.sgml : 20230517
<ACCEPTANCE-DATETIME>20230517160229
ACCESSION NUMBER:		0001169561-23-000056
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20230515
FILED AS OF DATE:		20230517
DATE AS OF CHANGE:		20230517

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Merrill Gary
		CENTRAL INDEX KEY:			0001560814

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33026
		FILM NUMBER:		23931574

	MAIL ADDRESS:	
		STREET 1:		2 CRESCENT PLACE
		CITY:			OCEANPORT
		STATE:			NJ
		ZIP:			07757

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			COMMVAULT SYSTEMS INC
		CENTRAL INDEX KEY:			0001169561
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-PREPACKAGED SOFTWARE [7372]
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0331

	BUSINESS ADDRESS:	
		STREET 1:		1 COMMVAULT WAY
		CITY:			TINTON FALLS
		STATE:			NJ
		ZIP:			07724
		BUSINESS PHONE:		732-870-4000

	MAIL ADDRESS:	
		STREET 1:		1 COMMVAULT WAY
		CITY:			TINTON FALLS
		STATE:			NJ
		ZIP:			07724
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>wk-form4_1684353728.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
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<ownershipDocument>

    <schemaVersion>X0407</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2023-05-15</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001169561</issuerCik>
        <issuerName>COMMVAULT SYSTEMS INC</issuerName>
        <issuerTradingSymbol>CVLT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001560814</rptOwnerCik>
            <rptOwnerName>Merrill Gary</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1 COMMVAULT WAY</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>TINTON FALLS</rptOwnerCity>
            <rptOwnerState>NJ</rptOwnerState>
            <rptOwnerZipCode>07724</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Financial Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <transactionDate>
                <value>2023-05-15</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>25669</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
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                <sharesOwnedFollowingTransaction>
                    <value>79267</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
                <footnoteId id="F3"/>
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            <transactionDate>
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                <directOrIndirectOwnership>
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                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">The common stock is being granted as restricted stock units and is subject to a 3-year vesting schedule, as follows: 1/3 on the first anniversary of the grant with the remaining portion vesting in equal quarterly installments thereafter.</footnote>
        <footnote id="F2">The common stock is being granted as performance share units (PSUs), 1/3 of which will vest, on each of the first, second and third anniversaries of the grant date of the award, if on such dates the Company's total shareholder return satisfies specified benchmarks relative to Russell 3000 index.</footnote>
        <footnote id="F3">The common stock is being granted as performance share units (PSUs), which will vest, over a three year period based on the Company's achievement of certain financial performance metrics tied to revenue measures.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ James J. Whalen, Attorney-in-Fact</signatureName>
        <signatureDate>2023-05-17</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
