Walker Keith Armistead (March 25, 1773 – October 13, 1845) was a military officer who served as Chief of Engineers of the United States Army Corps of Engineers. Armistead was born in Virginia, and served as an orderly sergeant at the Battle of Fallen Timbers. He graduated from West Point in 1803. During the War of 1812, he was promoted to lieutenant colonel and successively served as Chief Engineer of the Niagara frontier army and the of forces defending Chesapeake Bay. He was promoted to colonel and Chief Engineer on November 12, 1818. When the Army was reorganized on June 1, 1821, he became commander of the 3rd Artillery Regiment. He was brevetted brigadier general in November 1828. He succeeded Zachary Taylor as commander of the army during the Second Seminole War against the Seminole I