The Manster
- Jaar: 1959
- Land: United States of America, Japan
- Genre: Horror, Sciencefiction
- Studio: Lopert Pictures Corporation, Shaw-Breakston Enterprises, United Artists of Japan, William Shelton
- Trefwoord: monster, transformation, mad scientist, murder, police investigation, two-headed monster, scientific experiment
- Regisseur: George P. Breakston, Kenneth G. Crane
- Gips: Peter Dyneley, Jane Hylton, 中村哲, Terri Zimmern, Norman Van Hawley, ジェリー伊藤