John Forbes Benjamin (January 23, 1817 – March 8, 1877) was a U.S. Representative from Missouri.

Born in Cicero, New York, Benjamin attended the public schools.

He served as Democratic member of the Missouri House of Representatives 1850–1852.

He entered the Union Army as a private in 1861 and was subsequently promoted to the ranks of captain, major, lieutenant colonel, and brevet brigadier general.

He served as chairman of the Committee on Invalid Expenditures (Forty-first Congress).