Monsieur Klein is a 1976 mystery drama film directed by Joseph Losey, produced by and starring Alain Delon in the title role. Set in Vichy France, the Kafkaesque narrative follows an apparently Gentile Parisian art dealer who is seemingly mistaken for a Jewish man of the same name and targeted in the Holocaust, unable to prove his identity.

Joseph Walton Losey III 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 the films with screenplays by Harold Pinter: The Servant (1963) and The Go-Between (1971).