Elmer Loyd Hackney (July 8, 1916 – May 30, 1969) was a professional American football running back in the National Football League. Hackney was an 11th-round selection (92nd overall pick) by the Philadelphia Eagles in the 1940 NFL Draft out of Kansas State University. Hackney played seven seasons for the Eagles (1940), the Pittsburgh Steelers (1941), and the Detroit Lions (1942–1946). He was known as the "One Man Gang" and as "Iron Man".