| Kaijū Monogatari | |
| Developer: | Birthday |
| Publisher: | Namco |
| Series: | Kaijū Monogatari |
| Genre: | Role-playing video game |
| Modes: | Single-player |
| Platforms: | NES |
is a role-playing video game developed by Birthday and published by Namco for Famicom, in November 1988 in Japan. It was followed up by Daikaijū Monogatari on the Super Famicom.