Hercules Unchained is a 1959 Italian-French epic fantasy feature film starring Steve Reeves and Sylva Koscina in a story about two warring brothers and Hercules' tribulations in the court of Queen Omphale. The film is the sequel to the Reeves vehicle Hercules (1958) and marks Reeves' second – and last – appearance as Hercules. The film's screenplay, loosely based upon various Greek mythology and plays by Aeschylus and Sophocles, was written by Ennio De Concini and Pietro Francisci with Francisci directing and Bruno Vailati and Ferruccio De Martino producing the film.

Stephen Lester Reeves was an American professional bodybuilder and actor. He was famous in the mid-1950s as a movie star in Italian-made sword-and-sandal films, playing the protagonist as muscular characters such as Hercules, Goliath, and Sandokan. At the peak of his career, he was the highest-paid actor in Europe. Though best known for his portrayal of Hercules, he played the character only twice: in Hercules (1958), and in its 1959 sequel Hercules Unchained. By 1960, Reeves was ranked as the number-one box-office draw in 25 countries.