Hour of the Gun is a 1967 Western film depicting Wyatt Earp and Doc Holliday during their 1881 battles against Ike Clanton and his brothers in the Gunfight at the O.K. Corral, and the gunfight's aftermath in and around Tombstone, Arizona, starring James Garner as Earp, Jason Robards as Holliday, and Robert Ryan as Clanton. The film was directed by John Sturges.

Joseph Isaac Clanton was a member of a loose association of outlaws known as The Cowboys who clashed with lawmen Wyatt, Virgil and Morgan Earp as well as Doc Holliday. On October 26, 1881, Clanton was present at the Gunfight at the O.K. Corral in the boomtown of Tombstone, Arizona Territory but was unarmed and ran from the gunfight, in which his 19-year-old brother Billy was killed.