John Edward "Sheriff" Singleton (November 27, 1896 – October 23, 1937) was a Major League Baseball pitcher and National Football League halfback and wingback.
As a baseball player, Singleton was a member of the Philadelphia Phillies in the 1922 season.
In 22 career games, he had a 1–10 record with a 5.90 ERA.
In football, he played in five games for the Dayton Triangles in 1929.
This biographical article relating to an American baseball pitcher born in the 1890s is a stub.