WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

  

<ARTICLE> 6                       
<CIK>                356865
<NAME>               OPPENHEIMER LIFESPAN BALANCED FUND - B
<SERIES>                                                                 
   <NUMBER>          12
   <NAME>            OPPENHEIMER SERIES FUND, INC.
       
                                                                     
<PERIOD-TYPE>                                                           12-MOS
<FISCAL-YEAR-END>                                                       OCT-31-1997
<PERIOD-START>                                                          NOV-01-1996
<PERIOD-END>                                                            OCT-31-1997
<INVESTMENTS-AT-COST>                                                                  59,200,693
<INVESTMENTS-AT-VALUE>                                                                 66,792,544
<RECEIVABLES>                                                                           1,055,517
<ASSETS-OTHER>                                                                              1,812
<OTHER-ITEMS-ASSETS>                                                                      552,070
<TOTAL-ASSETS>                                                                         68,401,943
<PAYABLE-FOR-SECURITIES>                                                                  594,944
<SENIOR-LONG-TERM-DEBT>                                                                         0
<OTHER-ITEMS-LIABILITIES>                                                                 100,243
<TOTAL-LIABILITIES>                                                                       695,187
<SENIOR-EQUITY>                                                                                 0
<PAID-IN-CAPITAL-COMMON>                                                               56,647,053
<SHARES-COMMON-STOCK>                                                                     374,239
<SHARES-COMMON-PRIOR>                                                                     158,021
<ACCUMULATED-NII-CURRENT>                                                                 209,750
<OVERDISTRIBUTION-NII>                                                                          0
<ACCUMULATED-NET-GAINS>                                                                 3,257,932
<OVERDISTRIBUTION-GAINS>                                                                        0
<ACCUM-APPREC-OR-DEPREC>                                                                7,592,021
<NET-ASSETS>                                                                            4,761,973
<DIVIDEND-INCOME>                                                                         626,821
<INTEREST-INCOME>                                                                       2,157,148
<OTHER-INCOME>                                                                                  0
<EXPENSES-NET>                                                                            902,109
<NET-INVESTMENT-INCOME>                                                                 1,881,860
<REALIZED-GAINS-CURRENT>                                                                3,275,474
<APPREC-INCREASE-CURRENT>                                                               2,124,846
<NET-CHANGE-FROM-OPS>                                                                   7,282,180
<EQUALIZATION>                                                                                  0
<DISTRIBUTIONS-OF-INCOME>                                                                  86,844
<DISTRIBUTIONS-OF-GAINS>                                                                   69,269
<DISTRIBUTIONS-OTHER>                                                                           0
<NUMBER-OF-SHARES-SOLD>                                                                   253,560
<NUMBER-OF-SHARES-REDEEMED>                                                                49,667
<SHARES-REINVESTED>                                                                        12,325
<NET-CHANGE-IN-ASSETS>                                                                 12,881,415
<ACCUMULATED-NII-PRIOR>                                                                   194,574
<ACCUMULATED-GAINS-PRIOR>                                                               1,499,219
<OVERDISTRIB-NII-PRIOR>                                                                         0
<OVERDIST-NET-GAINS-PRIOR>                                                                      0
<GROSS-ADVISORY-FEES>                                                                     527,770
<INTEREST-EXPENSE>                                                                              0
<GROSS-EXPENSE>                                                                           916,277
<AVERAGE-NET-ASSETS>                                                                    3,503,634
<PER-SHARE-NAV-BEGIN>                                                                          11.98
<PER-SHARE-NII>                                                                                 0.27
<PER-SHARE-GAIN-APPREC>                                                                         1.08
<PER-SHARE-DIVIDEND>                                                                            0.29
<PER-SHARE-DISTRIBUTIONS>                                                                       0.32
<RETURNS-OF-CAPITAL>                                                                            0.00
<PER-SHARE-NAV-END>                                                                            12.72
<EXPENSE-RATIO>                                                                                 2.18
<AVG-DEBT-OUTSTANDING>                                                                          0
<AVG-DEBT-PER-SHARE>                                                                            0.00