The Prowler is a 1951 American film noir thriller film directed by Joseph Losey that stars Van Heflin and Evelyn Keyes. The film was produced by Sam Spiegel and was written by Dalton Trumbo. Because Trumbo was blacklisted at the time, the screenplay was credited to his friend, screenwriter Hugo Butler, as a front.

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).