<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM (A) THE
SIEBEL SYSTEMS, INC. FINANCIAL STATEMENTS AT DECEMBER 31, 1995 AND FOR THE YEAR
THEN ENDED AND AT MARCH 31, 1996 AND FOR THE 3 MONTHS ENDED AND IS QUALIFIED IN
ITS ENTIRETY BY REFERENCE TO SUCH (B) FINANCIAL STATEMENTS INCLUDED IN THE
SIEBEL SYSTEMS, INC. REGISTRATION STATEMENT ON FORM S-1.
</LEGEND>
<MULTIPLIER> 1000
<CURRENCY> U.S. DOLLARS
       
                                                   
<PERIOD-TYPE>                   YEAR                     3-MOS
<FISCAL-YEAR-END>                          DEC-31-1995             DEC-31-1996
<PERIOD-START>                             JAN-01-1995             JAN-01-1996
<PERIOD-END>                               DEC-31-1995             MAR-31-1996
<EXCHANGE-RATE>                                      1                       1
<CASH>                                          11,391                   9,757
<SECURITIES>                                         0                       0
<RECEIVABLES>                                    3,066                   3,112
<ALLOWANCES>                                         0                       0
<INVENTORY>                                          0                       0
<CURRENT-ASSETS>                                15,211                  13,581
<PP&E>                                           1,086                   2,354
<DEPRECIATION>                                     223                     348
<TOTAL-ASSETS>                                  16,091                  15,609
<CURRENT-LIABILITIES>                            6,129                   5,267
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          5                       5
<COMMON>                                             8                       9
<OTHER-SE>                                       9,921                  10,300
<TOTAL-LIABILITY-AND-EQUITY>                    16,091                  15,609
<SALES>                                          7,636                   4,402
<TOTAL-REVENUES>                                 8,038                   4,709
<CGS>                                               41                      26
<TOTAL-COSTS>                                      426                     369
<OTHER-EXPENSES>                                 7,240                   4,129
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                   7                       5
<INCOME-PRETAX>                                    528                     330
<INCOME-TAX>                                       211                     132
<INCOME-CONTINUING>                                  0                       0
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                       317                     198
<EPS-PRIMARY>                                        0                       0
<EPS-DILUTED>                                     0.02                    0.01