-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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 HurmLiSQT9N5JBr9GsEZow==

<SEC-DOCUMENT>0001088033-07-000017.txt : 20071024
<SEC-HEADER>0001088033-07-000017.hdr.sgml : 20071024
<ACCEPTANCE-DATETIME>20071024202809
ACCESSION NUMBER:		0001088033-07-000017
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20071015
FILED AS OF DATE:		20071024
DATE AS OF CHANGE:		20071024

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			QUEST SOFTWARE INC
		CENTRAL INDEX KEY:			0001088033
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-PREPACKAGED SOFTWARE [7372]
		IRS NUMBER:				330231678
		STATE OF INCORPORATION:			CA
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		5 POLARIS WAY
		CITY:			ALISO VIEJO
		STATE:			CA
		ZIP:			92656
		BUSINESS PHONE:		9497548000

	MAIL ADDRESS:	
		STREET 1:		5 POLARIS WAY
		CITY:			ALISO VIEJO
		STATE:			CA
		ZIP:			92656

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Reasoner Scott
		CENTRAL INDEX KEY:			0001415326

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-26937
		FILM NUMBER:		071189189

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		949-754-8000

	MAIL ADDRESS:	
		STREET 1:		C/O QUEST SOFTWARE, INC.
		STREET 2:		5 POLARIS WAY
		CITY:			ALISO VIEJO
		STATE:			CA
		ZIP:			92656
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2007-10-15</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001088033</issuerCik>
        <issuerName>QUEST SOFTWARE INC</issuerName>
        <issuerTradingSymbol>QSFT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001415326</rptOwnerCik>
            <rptOwnerName>Reasoner Scott</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O QUEST SOFTWARE, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>5 POLARIS WAY</rptOwnerStreet2>
            <rptOwnerCity>ALISO VIEJO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>92656</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>VP, Corporate Controller</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>15.36</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2015-10-03</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>4500</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>15.20</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <value>2016-02-17</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>4000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">This option vests as follows: (a) 20% on the first anniversary date of grant, which was October 3, 2005; and (b) 10% upon the completion of each of the eight six-month periods of employment thereafter.</footnote>
        <footnote id="F2">This option vests as follows: (a) 20% on the first anniversary date of grant, which was February 17, 2006; and (b) 10% upon the completion of each of the eight six-month periods of employment thereafter.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Scott H. Reasoner</signatureName>
        <signatureDate>2007-10-24</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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