Kamen Rider ZO (仮面ライダーZO, Kamen Raidā Zetto Ō), translated Masked Rider ZO, is a 1993 Japanese tokusatsu biopunk superhero movie produced by the Toei Company as part of their Kamen Rider Series. Directed by Keita Amemiya, it was the first joint production of Toei and Bandai. A Sega CD interactive movie was released for ZO in 1994, and was distributed in the United States as The Masked Rider: Kamen Rider ZO.

To commemorate the series' 40th anniversary, ZO was shown on Toei's pay-per-view channel in September 2011. The film's protagonist, Kamen Rider ZO, appears in the later Kamen Rider Decade television series and is a playable character in the 2011 Nintendo DS video game All Kamen Rider: Rider Generation.