Frontier Marshal is a 1939 American Western film directed by Allan Dwan and starring Randolph Scott as Wyatt Earp. The film is the second produced by Sol M. Wurtzel based on Stuart N. Lake's biography of Earp Wyatt Earp: Frontier Marshal (later found to be largely fictionalized). An earlier version was Wurtzel's Frontier Marshal, filmed in 1934. The film was remade by John Ford in 1946 as My Darling Clementine, including whole scenes reshot from the 1939 film.

Frontier Marshal costars Nancy Kelly, Cesar Romero as "Doc Halliday" (the name was changed for the film from the original "Holliday" because of fear of a lawsuit from Holliday's family), John Carradine and Lon Chaney Jr. Ward Bond appears as the town marshal; Bond was also in the 1934 version, and later appears as Morgan Earp in Ford's film. Eddie Foy Jr. plays the large supporting role of his father, entertainer Eddie Foy, in this as well as three other feature films.