Night Monster is a 1942 American black-and-white horror film featuring Bela Lugosi and produced and distributed by Universal Pictures Company. The movie uses an original story and screenplay by Clarence Upson Young and was produced and directed by Ford Beebe. For box office value, star billing was given to Bela Lugosi and Lionel Atwill, but the lead roles were played by Ralph Morgan, Irene Hervey and Don Porter, with Atwill in a character role as a pompous doctor who becomes a victim to the title character, and Lugosi in a small part as a butler.

The film is in many respects a remake of Doctor X, with virtually the same denouement. Both films also feature Atwill as a doctor.