Joseph Walton Losey III (January 14, 1909 – June 22, 1984) was an American theatre and film director, producer, and screenwriter. Born in Wisconsin, he studied in Germany with Bertolt Brecht and then returned to the United States. Blacklisted by Hollywood in the 1950s, he moved to Europe where he made the remainder of his films, mostly in the United Kingdom. Among the most critically and commercially successful were three films with screenplays by Harold Pinter: The Servant (1963), Accident (1967) and The Go-Between (1971).
Losey's 1976 film Monsieur Klein won the César Awards for Best film and Best director, with nominations in the same categories for the 1979 opera adaptation Don Giovanni. He was a four-time nominee for both the Palme d'Or (winning once) and the Golden Lion, and a two-time BAFTA nominee.