-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 NzVamzEnQuuW5gBRolJLQ5Afi9s2NkZ41V/67iNi9qmFPNPMPbwkjz59oPYhg6fJ
 OjhUrrRIYFCHLPAg6geqig==

<SEC-DOCUMENT>0000916480-08-000066.txt : 20080502
<SEC-HEADER>0000916480-08-000066.hdr.sgml : 20080502
<ACCEPTANCE-DATETIME>20080502123426
ACCESSION NUMBER:		0000916480-08-000066
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20080430
FILED AS OF DATE:		20080502
DATE AS OF CHANGE:		20080502

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			WAUSAU PAPER CORP.
		CENTRAL INDEX KEY:			0000105076
		STANDARD INDUSTRIAL CLASSIFICATION:	PAPER MILLS [2621]
		IRS NUMBER:				390690900
		STATE OF INCORPORATION:			WI
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		100 PAPER PLACE
		STREET 2:		ATTN:  SHERRI L. LEMMER
		CITY:			MOSINEE
		STATE:			WI
		ZIP:			54455
		BUSINESS PHONE:		7156934470

	MAIL ADDRESS:	
		STREET 1:		100 PAPER PLACE
		STREET 2:		ATTN:  SHERRI L. LEMMER
		CITY:			MOSINEE
		STATE:			WI
		ZIP:			54455

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	WAUSAU MOSINEE PAPER CORP
		DATE OF NAME CHANGE:	20030212

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	WAUSAU MOSINEE PAPER MILLS CORP
		DATE OF NAME CHANGE:	19980114

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			SMITH DAVID B JR
		CENTRAL INDEX KEY:			0001006972

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-13923
		FILM NUMBER:		08797692

	MAIL ADDRESS:	
		STREET 1:		1206 EAST SIXTH STREET
		CITY:			MERRILL
		STATE:			WI
		ZIP:			54452
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2008-04-30</periodOfReport>

    <issuer>
        <issuerCik>0000105076</issuerCik>
        <issuerName>WAUSAU PAPER CORP.</issuerName>
        <issuerTradingSymbol>WPP</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001006972</rptOwnerCik>
            <rptOwnerName>SMITH DAVID B JR</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1206 E. SIXTH STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MERRILL</rptOwnerCity>
            <rptOwnerState>WI</rptOwnerState>
            <rptOwnerZipCode>54452</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Common Stock Equivalent Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0</value>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2008-04-30</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>193.7984</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>1988-08-08</value>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <value>1988-08-08</value>
                <footnoteId id="F2"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>193.7984</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2413.5163</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Converts to common stock on a one-for-one basis.</footnote>
        <footnote id="F2">Stock equivalent units accrued under the Wausau Paper Corp. Deferred Compensation Plan for Directors; the value of the units is paid in cash at Director's termination of service.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Sherri L. Lemmer, Attorney-in-Fact</signatureName>
        <signatureDate>2008-05-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----