BOSTON PARTNERS
                                 FAMILY OF FUNDS


                      BOSTON PARTNERS LARGE CAP VALUE FUND
                       BOSTON PARTNERS MID CAP VALUE FUND
                     BOSTON PARTNERS SMALL CAP VALUE FUND II
                       BOSTON PARTNERS ALL-CAP VALUE FUND
                     BOSTON PARTNERS LONG/SHORT EQUITY FUND

                  (INVESTMENT PORTFOLIOS OF THE RBB FUND, INC.)

                               Institutional Class

                        Supplement dated August 22, 2003
                                       to
                       Prospectus dated December 31, 2002


THIS SUPPLEMENT PROVIDES NEW AND ADDITIONAL INFORMATION BEYOND THAT CONTAINED IN
THE  PROSPECTUS.  IT  SHOULD  BE  RETAINED  AND  READ IN  CONJUNCTION  WITH  THE
PROSPECTUS  AND THE  SUPPLEMENT  DATED  MAY 30,  2003  TO THE  PROSPECTUS  DATED
DECEMBER 31, 2002.


REVISIONS RELATING TO THE CLOSE OF THE BOSTON PARTNERS SMALL CAP VALUE FUND II.

         The following information should be added as the fourth paragraph under
the section entitled  "INTRODUCTION TO THE RISK/RETURN SUMMARY" on page 3 of the
Prospectus:

         The  Boston  Partners  Small  Cap  Value  Fund II will be closed to new
investors,  effective August 29, 2003. Please read "Other Purchase  Information"
beginning on page 35 for more information.


         The following  information should be added as the last paragraph of the
section  entitled  "OTHER  PURCHASE  INFORMATION"  beginning  on  page 35 of the
Prospectus:

         The  Boston  Partners  Small  Cap  Value  Fund II will be closed to new
investors,  effective  August 29,  2003,  subject to the  limitations  discussed
above.



               PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE.






                                 BOSTON PARTNERS
                                 FAMILY OF FUNDS


                      BOSTON PARTNERS LARGE CAP VALUE FUND
                       BOSTON PARTNERS MID CAP VALUE FUND
                     BOSTON PARTNERS SMALL CAP VALUE FUND II
                       BOSTON PARTNERS ALL-CAP VALUE FUND
                     BOSTON PARTNERS LONG/SHORT EQUITY FUND

                  (INVESTMENT PORTFOLIOS OF THE RBB FUND, INC.)

                                 Investor Class

                        Supplement dated August 22, 2003
                                       to
                       Prospectus dated December 31, 2002


THIS SUPPLEMENT PROVIDES NEW AND ADDITIONAL INFORMATION BEYOND THAT CONTAINED IN
THE  PROSPECTUS.  IT  SHOULD  BE  RETAINED  AND  READ IN  CONJUNCTION  WITH  THE
PROSPECTUS  AND THE  SUPPLEMENT  DATED  MAY 30,  2003  TO THE  PROSPECTUS  DATED
DECEMBER 31, 2002.


REVISIONS RELATING TO THE CLOSE OF THE BOSTON PARTNERS SMALL CAP VALUE FUND II.

         The following information should be added as the fourth paragraph under
the section entitled "INTRODUCTION" on page 3 of the Prospectus:

         The  Boston  Partners  Small  Cap  Value  Fund II will be closed to new
investors,  effective August 29, 2003. Please read "Other Purchase  Information"
on page 35 for more information.


         The following  information should be added as the last paragraph of the
section entitled "OTHER PURCHASE INFORMATION" on page 35 of the Prospectus:

         The  Boston  Partners  Small  Cap  Value  Fund II will be closed to new
investors,  effective  August 29,  2003,  subject to the  limitations  discussed
above.




               PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE.