Obed Benjamin Sullivan (born January 17, 1968) is an American former professional boxer. Nicknamed "The Fighting Marine", Sullivan was at times a highly ranked heavyweight who fought many significant fighters of his era. Sullivan turned pro in 1992 and accumulated a 28-1-1 record with an International Boxing Federation intercontinental belt and wins over the likes of Garing Lane, Levi Billups, James Gaines, and Marion Wilson, setting up a bout with fellow rising prospect Hasim Rahman in 1997 on HBO. Sullivan held his own and lost a majority decision.