Kamen Rider × Kamen Rider OOO & W Featuring Skull: Movie War Core (劇場版 仮面ライダー×仮面ライダー オーズ&ダブル feat.スカル MOVIE大戦CORE, Gekijōban Kamen Raidā × Kamen Raidā Ōzu Ando Daburu Fīcharingu Sukaru Mūbī Taisen Koa) is a 2010 tokusatsu superhero crossover film in the Kamen Rider franchise that features the casts of Kamen Rider W and Kamen Rider OOO. It was originally announced in a teaser at the end of the film Kamen Rider W Forever: A to Z/The Gaia Memories of Fate and was released in Japan on December 18, 2010.

Similar to Kamen Rider × Kamen Rider W & Decade: Movie War 2010, Movie War Core is split into three parts. The Kamen Rider W segment of the film, written by Riku Sanjo, takes place after the series' epilogue, where Akiko Narumi prepares for her wedding when her Kamen Rider friends become distracted by the Pteranodon Yummy (プテラノドンヤミー, Puteranodon Yamī). In the Kamen Rider OOO segment of the film, written by Toshiki Inoue, the Kougami Foundation discovers the mummified remains of Oda Nobunaga and creatie a Cell Medal-based homunculus of the man with his memories. The final segment joins the two groups to fight Kamen Rider Core when he threatens to destroy the world.

Movie War Core opened at number 1 in the Japanese box office in its first weekend, unseating Harry Potter and the Deathly Hallows – Part 1 from its two-week run at number 1.