The Mad Ghoul is a 1943 American horror film directed by James Hogan and starring Turhan Bey, Evelyn Ankers, and David Bruce, and featuring George Zucco, Robert Armstrong, and Milburn Stone. The film is about the scientist Dr. Alfred Morris and his assistant Ted Allison. Morris, who is obsessed with an ancient Mayan life-preserving process to the point of madness, has fallen in love with Allison's girlfriend, the concert singer Isabel Lewis. Morris decides to use Allison for his eternal-life experiments, transforming him into a zombie who slowly recalls his past life, but is unaware of his undead status.

The Mad Ghoul was developed at Universal Pictures in February 1943 under the title The Mystery of the Mad Ghoul. Filming was completed in May for a release on November 12 the same year.