<ARTICLE>             5
<LEGEND>
 THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
 CONSOLIDATED FINANCIAL STATEMENTS FOR THE NINE MONTHS ENDED SEPTEMBER 30,
 1999 OF WAUSAU-MOSINEE PAPER CORPORATION AND IS QUALIFIED IN ITS
 ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>

                                    
 <PERIOD-TYPE>                               9-MOS
 <FISCAL-YEAR-END>                     DEC-31-1999
 <PERIOD-END>                          SEP-30-1999
 <CASH>                                      2,540
 <SECURITIES>                                    0
 <RECEIVABLES>                             101,581
 <ALLOWANCES>                               11,105
 <INVENTORY>                               147,026
 <CURRENT-ASSETS>                          259,387
 <PP&E>                                  1,111,622
 <DEPRECIATION>                            464,065
 <TOTAL-ASSETS>                            938,964
 <CURRENT-LIABILITIES>                     110,415
 <BONDS>                                   227,663
 <COMMON>                                  170,681
 <PREFERRED-MANDATORY>                           0
 <PREFERRED>                                     0
 <OTHER-SE>                                223,327
 <TOTAL-LIABILITY-AND-EQUITY>              938,964
 <SALES>                                   706,523
 <TOTAL-REVENUES>                          706,523
 <CGS>                                     597,004
 <TOTAL-COSTS>                             641,204
 <OTHER-EXPENSES>                             (102)
 <LOSS-PROVISION>                                0
 <INTEREST-EXPENSE>                          8,314
 <INCOME-PRETAX>                            57,107
 <INCOME-TAX>                               21,490
 <INCOME-CONTINUING>                        35,617
 <DISCONTINUED>                                  0
 <EXTRAORDINARY>                                 0
 <CHANGES>                                       0
 <NET-INCOME>                               35,617
 <EPS-BASIC>                                  0.68
 <EPS-DILUTED>                                0.66