EXHIBIT 11
 
                       Morgan Stanley Dean Witter & Co.
                      Computation of Earnings Per Share 
                       (In millions, except share data)





                                                                     Three Months Ended
                                                      ------------------------------------------------
                                                       February 28, 1998           February 28, 1997
                                                      --------------------       ---------------------
                                                                           
Basic EPS:                                                                       
     Net income                                               $        691                $        571
     Less:  preferred stock dividend requirements                      (15)                        (19)
                                                      --------------------       ---------------------
     Net income available to common shareholders              $        676                $        552
                                                      ====================       =====================
     Weighted-average common shares outstanding                586,751,340                 573,410,658
                                                      ====================       =====================
     Basic EPS                                                $       1.15                $       0.96
                                                      ====================       =====================
                                                                                 
Diluted EPS                                                                      
     Net  income                                              $        691                $        571
     Less:  preferred stock dividend requirements                                
      after assumed conversion of ESOP                                           
         preferred stock                                               (13)                        (18)
                                                      --------------------       ---------------------
     Net income available to common shareholders              $        678                $        553
                                                      ====================       =====================
                                                                                 
     Weighted-average common shares outstanding                586,751,340                 573,410,658
     Effect of dilutive securities:                                              
        Stock options                                           17,607,461                  20,084,781
        ESOP convertible preferred stock                        12,018,761                  12,195,627
                                                      --------------------       --------------------- 
     Weighted-average common shares outstanding                                  
       and common stock equivalents                            616,377,562                 605,691,066
                                                      ====================       =====================
     Diluted EPS                                              $       1.10                $       0.91
                                                      ====================       =====================