Richard Mentor Johnson (October 17, 1780– November 19, 1850) was the ninth Vice President of the United States, serving in the administration of Martin Van Buren (1837–41). He is the only vice president ever elected by the United States Senate under the provisions of the Twelfth Amendment. Johnson also represented Kentucky in the U.S. House of Representatives and Senate; he began and ended his political career in the Kentucky House of Representatives.

Johnson was elected to the U.S. House of Representatives in 1806. He became allied with fellow Kentuckian Henry Clay as a member of the War Hawks faction that favored war with Britain in 1812. At the outset of the War of 1812, Johnson was commissioned a colonel in the Kentucky Militia and commanded a regiment of mounted volunteers from 1812 to 1813. He and his brother James served under William Henry Harrison in Upper Canada. Johnson participated in the Battle of the Thames. Some reported that he personally killed the Shawnee chief Tecumseh, which he later used to his political advantage.