<ARTICLE> 5 <LEGEND> Unocal Corporation FDS </LEGEND> <MULTIPLIER> 1,000,000 <PERIOD-TYPE> 3-MOS <FISCAL-YEAR-END> DEC-31-1999 <PERIOD-START> JAN-01-1999 <PERIOD-END> MAR-31-1999 <CASH> 182 <SECURITIES> 0 <RECEIVABLES> 795 <ALLOWANCES> (56) <INVENTORY> 195 <CURRENT-ASSETS> 1,259 <PP&E> 15,333 <DEPRECIATION> (10,161) <TOTAL-ASSETS> 7,809 <CURRENT-LIABILITIES> 1,175 <BONDS> 2,568 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 252 <OTHER-SE> 2,387 <TOTAL-LIABILITY-AND-EQUITY> 7,809 <SALES> 1,189 <TOTAL-REVENUES> 1,231 <CGS> 851 <TOTAL-COSTS> 1,214 <OTHER-EXPENSES> 65 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 45 <INCOME-PRETAX> 17 <INCOME-TAX> 10 <INCOME-CONTINUING> 7 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 7 <EPS-PRIMARY> 0.03 <EPS-DILUTED> 0.03