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