Benjamin Franklin Isherwood (October 6, 1822 – June 19, 1915) was an engineering officer in the United States Navy during the early days of steam-powered warships.
He served as a ship's engineer during the Mexican–American War, and after the war did experimental work with steam propulsion.
Rising to the rank of rear admiral, as Engineer-in-Chief of the Navy during the Civil War, he helped to found the Navy's Bureau of Steam Engineering.