William Humphrey Foy (July 4, 1886 – May 2, 1956) was a college football player.
Foy was a prominent fullback for the Auburn Tigers of Alabama Polytechnic Institute. The Auburn media guide also lists his position as a tackle.
He was injured in the 1903 season, suffering a broken collarbone.
He made the All-Southern team in 1904, Mike Donahue's first season as head coach. Auburn was the undefeated SIAA co-champion with Vanderbilt and its first year coach Dan McGugin. He was the second Auburn player ever selected All-Southern, behind only James Elmer.