Leo Florian Hauck (November 4, 1888 – January 21, 1950) was an American boxer.

During his career he was able to achieve victories over many Hall of Famers including Jack Britton, Jack Dillon, Battling Levinsky, Frank Klaus, Billy Papke, Jeff Smith and Harry Lewis.

He also faced the likes of Harry Greb, Gene Tunney and Mike Gibbons.

He began boxing in 1902 as a flyweight, and fought successfully in every weight division up to heavyweight.

Houck also worked as a referee and judge in the state of Pennsylvania.