<ARTICLE>                                                                      5
<LEGEND>
     Unocal Corporation FDS

<MULTIPLIER>                                                           1,000,000

                                                                  
<PERIOD-TYPE>                                                              9-MOS
<FISCAL-YEAR-END>                                                    DEC-31-2000
<PERIOD-START>                                                       JAN-01-2000
<PERIOD-END>                                                         SEP-30-2000
<CASH>                                                                      507
<SECURITIES>                                                                 80
<RECEIVABLES>                                                             1,193
<ALLOWANCES>                                                                (89)
<INVENTORY>                                                                 123
<CURRENT-ASSETS>                                                          1,997
<PP&E>                                                                   16,728
<DEPRECIATION>                                                          (10,549)
<TOTAL-ASSETS>                                                            9,908
<CURRENT-LIABILITIES>                                                     1,821
<BONDS>                                                                   2,666
<PREFERRED-MANDATORY>                                                         0
<PREFERRED>                                                                   0
<COMMON>                                                                    254
<OTHER-SE>                                                                2,339
<TOTAL-LIABILITY-AND-EQUITY>                                              9,908
<SALES>                                                                   6,156
<TOTAL-REVENUES>                                                          6,520
<CGS>                                                                     4,468
<TOTAL-COSTS>                                                             5,661
<OTHER-EXPENSES>                                                            232
<LOSS-PROVISION>                                                              0
<INTEREST-EXPENSE>                                                          159
<INCOME-PRETAX>                                                             862
<INCOME-TAX>                                                                309
<INCOME-CONTINUING>                                                         550
<DISCONTINUED>                                                               37
<EXTRAORDINARY>                                                               0
<CHANGES>                                                                     0
<NET-INCOME>                                                                587
<EPS-BASIC>                                                                2.42
<EPS-DILUTED>                                                              2.37