William Lyon (March 9, 1923 – May 22, 2020) was a major general of the United States Air Force who served as Commander of the United States Air Force Reserve Command, Headquarters U.S. Air Force, Washington D.C., and commander, Headquarters Air Force Reserve, a separate operating agency located at Robins Air Force Base, Georgia. As chief of Air Force Reserve, Lyon served as the principal adviser on Reserve matters to the Air Force Chief of Staff. As commander of AFRES, he had full responsibility for the supervision of U.S. Air Force Reserve units around the world.