Joseph Losey (January 14, 1909 - June 22, 1984) was an American theater and film director.

He was born in La Crosse, Wisconsin. After studying in Germany with Bertolt Brecht, Losey returned to the United States, eventually making his way to Hollywood.

During the McCarthy Era, he was investigated for his supposed ties with the Communist Party and blacklisted. His career in shambles, he moved to London, where he continued working as a director.

His film The Go-Between won the Golden Palm Award at the 1971 Cannes Film Festival. Even in the UK, however, he experienced problems: originally slated to direct the 1956 Hammer Films production X the Unknown, after a few days work on the project star Dean Jagger refused to work with a supposed Communist sympathiser and Losey was moved off the project.

Losey died in London in 1984.

Filmography as director includes

• Steaming (1985)
• La Truite (1982)
• Don Giovanni (1979) - screen adaptation of the opera Don Giovanni by Wolfgang Amadeus Mozart
• Les Routes du sud (1978)
• Monsieur Klein (1976)
• Galileo (1975) - screen adaptation of the play Life of Galileo by Bertolt Brecht
• The Romantic Englishwoman (1975)
• A Doll's House (1973)
• The Assassination of Trotsky (1972)
• The Go-Between (1970)
• Figures in a Landscape (1970) (as Joseph Walton)
• Secret Ceremony (1968)
• Boom (1968)
• Accident (1967)
• Modesty Blaise (1966)
• King & Country (1964)
• The Servant (1963)
• The Damned (1963)
• Eva (1962)
• The Criminal (1960)
• First on the Road (1959)
• Blind Date (1958)
• The Gypsy and the Gentleman (1958)
• Time Without Pity (1957)
• The Intimate Stranger (1956) (as Joseph Walton) (uncredited on some prints)
• A Man on the Beach (1955)
• The Sleeping Tiger (1954) (as Victor Hanbury)
• Imbarco a mezzanotte (1951) (as Andrea Forzano)
• The Big Night (1951)
• M (1951)
• The Prowler (1951)
• The Lawless (1950)
• The Boy with Green Hair (1948)
• Leben des Galilei (1947)
• A Gun in His Hand (1945)
• A Child Went Forth (1941)
• Youth Gets a Break (1941)
• Pete Roleum and His Cousins (1939)