Cahill U.S. Marshal is a 1973 American Western film in Technicolor starring John Wayne as a driven lawman in a black hat. The film was directed by Andrew V. McLaglen and filmed on location in Durango, Mexico. The supporting cast features George Kennedy, Neville Brand, Marie Windsor, Royal Dano, Denver Pyle, Jackie Coogan, Harry Carey Jr., Paul Fix and Hank Worden.