Peter T. Grauer (born 1945) is an American businessman and entrepreneur. He has been a member of the Bloomberg L.P. Board since October 1996 and was named chairman of the Board in March 2001 succeeding Michael Bloomberg. Grauer joined Bloomberg full-time in his executive capacities in March 2002. Prior to becoming a member of Bloomberg L.P. in 1996, Grauer was the founder of DLJ Merchant Banking Partners and Investment.