Redline (Japanese: レッドライン, Hepburn: Reddo rain, stylized as REDLINE) is a 2009 Japanese animated science fiction film produced by Madhouse and directed by Takeshi Koike in his directorial debut. It stars Takuya Kimura, Yū Aoi, Tatsuya Gashūin, Yoshinori Okada, Kanji Tsuda, Yoshiyuki Morishita, Akemi, Takeshi Aono, Kōsei Hirota, Unshō Ishizuka, Kenta Miyake, Kōji Ishii, Chō, Kenyu Horiuchi, Tadanobu Asano, and its screenplay was written by Katsuhito Ishii, Yōji Enokido and Yoshiki Sakurai, based on an original story by Ishii. It is set in the distant future, where a man known as JP takes on great risks for the chance of winning the titular underground race.

The film was in production for seven years, and used over 100,000 hand-drawn frames. It premiered at the Locarno International Film Festival on August 14, 2009, and was theatrically released in Japan on October 9, 2010, by Tohokushinsha Film. Despite positive reviews, with particular praise for its animation, Redline was unsuccessful at the box office. It saw greater success following its home release, and is considered a cult film.