The Manster
- Ano: 1959
- País: United States of America, Japan
- Gênero: Terror, Ficção científica
- Estúdio: Lopert Pictures Corporation, Shaw-Breakston Enterprises, United Artists of Japan, William Shelton
- Palavra-chave: monster, transformation, mad scientist, murder, police investigation, two-headed monster, scientific experiment
- Diretor: George P. Breakston, Kenneth G. Crane
- Fundida: Peter Dyneley, Jane Hylton, 中村哲, Terri Zimmern, Norman Van Hawley, ジェリー伊藤