A monster movie, monster film, creature feature or giant monster film is a film that focuses on one or more characters struggling to survive attacks by one or more antagonistic monsters, often abnormally large ones. The film may also fall under the horror, comedy, fantasy, or science fiction genres. Monster movies originated with adaptations of horror folklore and literature.

Kaiju is a Japanese term that is commonly associated with media involving giant monsters. A subgenre of science fiction, it was created by Eiji Tsuburaya and Ishirō Honda. The term can also refer to the giant monsters themselves, which are usually depicted attacking major cities and battling either the military or other monsters.