Rio Lobo is a 1970 American Western film directed and produced by Howard Hawks and starring John Wayne, from a screenplay by Burton Wohl and Leigh Brackett. The film was shot in Cuernavaca in the Mexican state of Morelos and in Tucson, Arizona. The musical score was composed by Jerry Goldsmith. It was the third Howard Hawks film to explore the theme of a town sheriff defending his office against belligerent local outlaws: the others were Rio Bravo (1959) and El Dorado (1966), both also starring John Wayne. Rio Lobo was the last film Hawks made.