Kamen Rider Kiva the Movie: King of the Castle in the Demon World is the theatrical film adaptation of the Japanese 2008 Kamen Rider series, Kamen Rider Kiva, directed by Ryuta Tasaki and written by Toshiki Inoue. A director's cut came out in June 2009.

The Kamen Rider Series , also known as Masked Rider Series, is a Japanese superhero media franchise consisting of tokusatsu television programs, films, manga, and anime, created by manga artist Shotaro Ishinomori. Kamen Rider media generally features a motorcycle-riding superhero with an insect motif who fights supervillains, often known as kaijin .