Knock on Any Door is a 1949 American courtroom trial film noir directed by Nicholas Ray and starring Humphrey Bogart. The movie was based on the 1947 novel of the same name by Willard Motley. The picture gave actor John Derek his breakthrough role as young hoodlum Nick Romano, whose motto was, "live fast, die young, and have a good looking corpse."

Nicholas Ray was an American film director, screenwriter, and actor. Described by the Harvard Film Archive as "Hollywood's last romantic" and "one of postwar American cinema’s supremely gifted and ultimately tragic filmmakers," Ray was considered an iconoclastic auteur director who often clashed with the Hollywood studio system of the time, but would prove highly influential to future generations of filmmakers.