Samuel Cromwell (died December 1, 1842) was a sailor and petty officer {Boatswain's Mate} aboard the brig USS Somers. Cromwell was feared by the young apprentices who made up the majority of the ship's crew, and was rumored to have served on a slaver at one time. These rumors lent credence to the idea that he would have been amenable to Philip Spencer's alleged plot to mutiny, kill the ship's officers and such of the crewmembers as were not wanted, and sail the Somers either as a pirate ship or a slaver.