Richard C. Mangrum (October 27, 1906 – September 28, 1985) was a United States Marine Corps lieutenant general who served as Assistant Commandant of the Marine Corps from 1965 to 1967. Mangrum was a Marine Corps aviator who was awarded the Navy Cross and the Distinguished Flying Cross for his actions during the Guadalcanal Campaign in World War II. On October 1, 1965, Mangrum became the "Gray Eagle" of Naval Aviation, and is the first Marine Aviator to attain this distinction.