John the Bastard () is a 1967 Italian Spaghetti Western film written and directed by Armando Crispino and starring John Richardson. The film is a western adaptation of Wolfgang Amadeus Mozart's opera Don Giovanni.
John is the illegitimate son of a wealthy landowner. He decides to take revenge for the disinterest that his father has always shown towards him. He becomes the lover of his stepbrother's wife and when he challenges him to a duel he kills him. The woman commits suicide and John, satisfied, continues his cynical existence until the relatives of other women seduced by him try to kill him.