Exhibit 32.1

                                 CERTIFICATION
                                      OF
                       WAUSAU-MOSINEE PAPER CORPORATION
                UNDER SECTION 906 OF SARBANES-OXLEY ACT OF 2002


      The undersigned Chief Executive Officer and Chief Financial Officer of
Wausau-Mosinee Paper Corporation (the "Company") certify pursuant to Section
906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C. Section 1350, that (1) the
Quarterly Report on Form 10-Q of the Company for the quarterly period ended
September 30, 2003  (the "Report") fully complies with the requirements of
Section 13(a) or 15(d) of the Securities Exchange Act of 1934, 15 U.S.C. 78m or
78o(d), and (2) the information contained in the Report fairly presents, in all
material respects, the financial condition and results of operation of the
Company.

      Date: November 13, 2003

                                           THOMAS J. HOWATT
                                           Thomas J. Howatt
                                           President and CEO


                                           SCOTT P. DOESCHER
                                           Scott P. Doescher
                                           Senior Vice President, Finance
                                           (Chief Financial Officer)


      A signed original of this written statement required by Section 906 has
      been provided to Wausau-Mosinee Paper Corporation and will be retained by
      Wausau-Mosinee Paper Corporation and furnished to the Securities and
      Exchange Commission or its staff upon request.