<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM FORRESTER
RESEARCH INC'S MARCH 31, 1998 CONSOLIDATED FINANCIAL STATEMENTS AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS CONTAINED IN FORM
10-K.
</LEGEND>
<CURRENCY> U.S. DOLLARS
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               MAR-31-1998
<EXCHANGE-RATE>                                      1
<CASH>                                       3,202,629
<SECURITIES>                                53,904,621
<RECEIVABLES>                               12,917,783
<ALLOWANCES>                                   340,000
<INVENTORY>                                          0
<CURRENT-ASSETS>                            73,257,471
<PP&E>                                       9,116,226
<DEPRECIATION>                               2,593,541
<TOTAL-ASSETS>                              79,780,156
<CURRENT-LIABILITIES>                       36,742,217
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        84,684
<OTHER-SE>                                  42,953,255
<TOTAL-LIABILITY-AND-EQUITY>                79,780,156
<SALES>                                              0
<TOTAL-REVENUES>                            13,131,189
<CGS>                                                0
<TOTAL-COSTS>                                4,828,660
<OTHER-EXPENSES>                             6,854,656
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                              2,163,510
<INCOME-TAX>                                   821,027
<INCOME-CONTINUING>                          1,342,483
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                 1,342,483
<EPS-PRIMARY>                                      .16
<EPS-DILUTED>                                      .15