<?xml version="1.0"?>
<ownershipDocument>
    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType><periodOfReport>2003-08-18</periodOfReport>
    <issuer>
        <issuerCik>0000892449</issuerCik>
        <issuerName>VENTURE FINANCIAL GROUP INC</issuerName>
        <issuerTradingSymbol>N/A</issuerTradingSymbol></issuer><reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001034304</rptOwnerCik>
            <rptOwnerName>PARSONS KEN F SR</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O VENTURE BANK</rptOwnerStreet1>
            <rptOwnerStreet2>721 COLLEGE ST SE</rptOwnerStreet2>
            <rptOwnerCity>LACEY</rptOwnerCity>
            <rptOwnerState>WA</rptOwnerState>
            <rptOwnerZipCode>98503</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>1</isDirector><isOfficer>1</isOfficer><isTenPercentOwner>1</isTenPercentOwner><isOther>0</isOther><officerTitle>PRESIDENT/CEO/CHAIRMAN</officerTitle></reportingOwnerRelationship></reportingOwner><nonDerivativeTable><nonDerivativeTransaction><securityTitle><value>COMMON STOCK</value></securityTitle><transactionDate><value>2003-08-18</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>P</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionAmounts><transactionShares><value>22</value></transactionShares><transactionPricePerShare><value>21.00</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>A</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>260554</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></nonDerivativeTransaction><nonDerivativeHolding><securityTitle><value>COMMON STOCK</value></securityTitle><postTransactionAmounts><sharesOwnedFollowingTransaction><value>66508</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value></directOrIndirectOwnership><natureOfOwnership><value>EMPLOYEE STOCK OWNERSHIP PLAN HELD BY TRUSTEES</value></natureOfOwnership></ownershipNature></nonDerivativeHolding><nonDerivativeTransaction><securityTitle><value>COMMON STOCK</value></securityTitle><transactionDate><value>2003-08-18</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>P</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionAmounts><transactionShares><value>13</value></transactionShares><transactionPricePerShare><value>21.00</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>A</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>3656</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value></directOrIndirectOwnership><natureOfOwnership><value>SPOUSE'S IRA</value></natureOfOwnership></ownershipNature></nonDerivativeTransaction></nonDerivativeTable><derivativeTable><derivativeHolding><securityTitle><value>COMMON STOCK</value></securityTitle><conversionOrExercisePrice><value>8.63</value></conversionOrExercisePrice><exerciseDate><value>1997-03-01</value></exerciseDate><expirationDate><value>2006-03-01</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>COMMON STOCK</value></underlyingSecurityTitle><underlyingSecurityShares><value>92610</value><footnoteId id="F1"/></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>92610</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>COMMON STOCK</value></securityTitle><conversionOrExercisePrice><value>8.63</value></conversionOrExercisePrice><exerciseDate><value>1997-03-01</value></exerciseDate><expirationDate><value>2006-03-01</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>COMMON STOCK</value></underlyingSecurityTitle><underlyingSecurityShares><value>116920</value><footnoteId id="F2"/></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>174830</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>COMMON STOCK</value></securityTitle><conversionOrExercisePrice><value>10.25</value></conversionOrExercisePrice><exerciseDate><value>2003-04-19</value></exerciseDate><expirationDate><value>2012-04-19</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>COMMON STOCK</value></underlyingSecurityTitle><underlyingSecurityShares><value>3000</value><footnoteId id="F3"/></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>177830</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>COMMON STOCK</value></securityTitle><conversionOrExercisePrice><value>20.50</value></conversionOrExercisePrice><exerciseDate><value>2004-08-01</value></exerciseDate><expirationDate><value>2013-08-01</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>COMMON STOCK</value></underlyingSecurityTitle><underlyingSecurityShares><value>2500</value><footnoteId id="F4"/></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>180330</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding></derivativeTable><footnotes><footnote id="F1">The option vests in five equal annual installments beginning 03/01/1997.</footnote><footnote id="F2">The option vests in five equal annual installments beginning 03/01/1997.</footnote><footnote id="F3">The option vests in five equal annual installments beginning 04/19/2003.</footnote><footnote id="F4">The option vests in five equal annual installments beginning 08/01/2004.</footnote></footnotes><remarks/><ownerSignature><signatureName>LEIGH BAXTER, ATTORNEY IN FACT</signatureName><signatureDate>2003-08-19</signatureDate></ownerSignature></ownershipDocument>

