UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549

                           _________________________

                                   FORM 8-K

                                CURRENT REPORT


               Pursuant to Section 13 or 15(d) of the Securities
                             Exchange Act of 1934

                           _________________________

       Date of Report (date of earliest event reported):  APRIL 25, 2006


                              WAUSAU PAPER CORP.
            (Exact name of registrant as specified in its charter)


         WISCONSIN                  1-13923                   39-0690900
      (State or other          (Commission File              (IRS Employer
      jurisdiction of               Number)                 Identification
      incorporation)                                            Number)

                                100 PAPER PLACE
                            MOSINEE, WI 54455-9099
         (Address of principal executive offices, including Zip Code)

                                (715) 693-4470
             (Registrant's telephone number, including area code)


      Check the appropriate box below if the Form 8-K filing is intended to
simultaneously satisfy the filing obligation of the registrant under any of the
following provisions:

   *  Written communications pursuant to Rule 425 under the Securities Act (17
      CFR 23.425)

   *  Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17
      CFR 240.14a-12)

   *  Pre-commencement communications pursuant to Rule 14d-2(b) under the
      Exchange Act (17 CFR 240.14d-2(b))
   *  Pre-commencement communications pursuant to Rule 13e-4(c) under the
      Exchange Act (17 CFR 240.13e-4(c))

                   INFORMATION TO BE INCLUDED IN THE REPORT


SECTION 2 - FINANCIAL INFORMATION

ITEM 2.02.  RESULTS OF OPERATIONS AND FINANCIAL CONDITION

      On April 25, 2006, the Company reported a net loss of $1.3 million, or
$.03 per diluted share, for the first quarter ended March 31, 2006, as compared
to a net earnings of $1.9 million, or $.04 per diluted share, for the first
quarter of 2005.  Net sales for the first quarter increased to $283.7 million
from $267.7 million in 2005.  A copy of the news release is furnished as
Exhibit 99.1 to this report.*

SECTION 9 - FINANCIAL STATEMENTS AND EXHIBITS

ITEM 9.01   FINANCIAL STATEMENTS AND EXHIBITS

      Exhibit 99.1  *News release dated April 25, 2006

* This exhibit is furnished pursuant to Item 2.02 and shall not be deemed to
  have been filed or incorporated by reference into any other filing by the
  Company under the Securities Act of 1933 or Securities Exchange Act of 1934
  unless expressly so provided by specific reference in such filing.


                                  SIGNATURES

      Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.

                                    WAUSAU PAPER CORP.


Date:  April 25, 2006               By:    SCOTT P. DOESCHER
                                           Scott P. Doescher
                                           Senior Vice President-Finance

                                 EXHIBIT INDEX
                                      TO
                                   FORM 8-K
                                      OF
                              WAUSAU PAPER CORP.
                             DATED APRIL 25, 2006
                 Pursuant to Section 102(d) of Regulation S-T
                        (17 C.F.R. Section 232.102(d))




99.1  NEWS RELEASE DATED APRIL 25, 2006