Duel at Diablo is a 1966 American western film starring James Garner in his first Western since leaving Maverick and Sidney Poitier in his first Western. Based on Marvin H. Albert's 1957 novel Apache Rising, the film was written by Albert and Michael M. Grilikhes and directed by Ralph Nelson who had directed Poitier in Lilies of the Field. The supporting cast includes Bibi Andersson, Bill Travers, Dennis Weaver and John Hoyt; Ralph Nelson has a cameo as an Army Major. The movie was shot on location amidst striking scenery in Utah; the musical score was composed by Neal Hefti.
Writing in The New York Times, Robert Alden gave a positive review, stating that "Much of it is raw and ugly, yet it is a film that will grip you, a film that will have a shattering effect by the time you go back out into the street."