William Young Smith (August 13, 1925 – January 19, 2016) was an American military official. He was a United States Air Force four-star general. He was Chief of Staff, Supreme Headquarters Allied Powers Europe (COFS SHAPE) from 1979 to 1981 and as Deputy Commander in Chief, U.S. European Command (DCINCEUR) from 1981 until his retirement from military service in 1983.