Jack Haley (August 10, 1898 – June 6, 1979) (born John Joseph Haley, Jr.) was an American film actor best known for his portrayal of the Tin Man in The Wizard of Oz. He also portrayed farmworker Hickory, who appeared in the Kansas sequences, in the film.

Haley starred in vaudeville as a song-and-dance comedian. One of his closest friends was fellow vaudeville alumnus Fred Allen, who would frequently mention "Mr. Jacob Haley of Newton Highlands, Massachusetts" on the air.

In the early 1930s Haley starred in comedy shorts for Vitaphone in Brooklyn, New York. His wide-eyed, good-natured expression landed him supporting roles in musical feature films like Poor Little Rich Girl with Shirley Temple, Higher and Higher with Frank Sinatra and the Irving Berlin musical Alexander's Ragtime Band. Both Poor Little Rich Girl and Alexander's Ragtime Band were released by Twentieth Century-Fox.