<ARTICLE> 9
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM GREATER BAY
BANCORP FORM 10-Q AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               MAR-31-1999
<CASH>                                          68,185
<INT-BEARING-DEPOSITS>                               0
<FED-FUNDS-SOLD>                                90,400
<TRADING-ASSETS>                                     0
<INVESTMENTS-HELD-FOR-SALE>                    262,954
<INVESTMENTS-CARRYING>                          84,859
<INVESTMENTS-MARKET>                            84,793
<LOANS>                                      1,144,549
<ALLOWANCE>                                   (21,915)
<TOTAL-ASSETS>                               1,781,296
<DEPOSITS>                                   1,539,077
<SHORT-TERM>                                         0
<LIABILITIES-OTHER>                             93,962
<LONG-TERM>                                     50,000
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        58,496
<OTHER-SE>                                      39,761
<TOTAL-LIABILITIES-AND-EQUITY>               1,781,296
<INTEREST-LOAN>                                 24,670
<INTEREST-INVEST>                                5,130
<INTEREST-OTHER>                                 1,541
<INTEREST-TOTAL>                                31,341
<INTEREST-DEPOSIT>                              10,892
<INTEREST-EXPENSE>                              12,981
<INTEREST-INCOME-NET>                           18,360
<LOAN-LOSSES>                                      861
<SECURITIES-GAINS>                                   0
<EXPENSE-OTHER>                                 11,035
<INCOME-PRETAX>                                  8,398
<INCOME-PRE-EXTRAORDINARY>                       5,146
<EXTRAORDINARY>                                   (88)
<CHANGES>                                            0
<NET-INCOME>                                     5,058
<EPS-PRIMARY>                                     0.52
<EPS-DILUTED>                                     0.49
<YIELD-ACTUAL>                                    4.83
<LOANS-NON>                                      2,847
<LOANS-PAST>                                         0
<LOANS-TROUBLED>                                   482
<LOANS-PROBLEM>                                      0
<ALLOWANCE-OPEN>                                21,304
<CHARGE-OFFS>                                    (263)
<RECOVERIES>                                        13
<ALLOWANCE-CLOSE>                               21,915
<ALLOWANCE-DOMESTIC>                            21,915
<ALLOWANCE-FOREIGN>                                  0
<ALLOWANCE-UNALLOCATED>                              0