<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS OF INTERNET SECURITY SYSTEMS, INC.
AS OF AND FOR THE SIX MONTHS ENDED JUNE 30, 2000 AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-2000
<PERIOD-START>                             JAN-01-2000
<PERIOD-END>                               JUN-30-2000
<EXCHANGE-RATE>                                      1
<CASH>                                          79,096
<SECURITIES>                                    51,985
<RECEIVABLES>                                   39,163
<ALLOWANCES>                                     1,071
<INVENTORY>                                        571
<CURRENT-ASSETS>                               173,616
<PP&E>                                          21,768
<DEPRECIATION>                                  10,230
<TOTAL-ASSETS>                                 204,632
<CURRENT-LIABILITIES>                           36,151
<BONDS>                                              0
                                0
                                          0
<COMMON>                                            42
<OTHER-SE>                                     168,272
<TOTAL-LIABILITY-AND-EQUITY>                   204,632
<SALES>                                              0
<TOTAL-REVENUES>                                83,508
<CGS>                                                0
<TOTAL-COSTS>                                   76,208
<OTHER-EXPENSES>                                    31
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                 11,207
<INCOME-TAX>                                     4,056
<INCOME-CONTINUING>                              7,151
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     7,151
<EPS-BASIC>                                      $0.17
<EPS-DILUTED>                                    $0.16


</TABLE>



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