Rah Xephon (ラーゼフォン, Rāzefon^?) is a Japanese anime series about 17-year-old Ayato Kamina, his ability to control a godlike mecha known as the RahXephon, and his inner journey to find a place in the world around him. His peaceful life as a student and artist in Tokyo is suddenly interrupted by a mysterious woman who appears to be stalking him, strange planes invading the city, and even stranger machines fighting back.

The original 26-episode anime television series was the first directed by Yutaka Izubuchi. It was created by Izubuchi and Bones, and it aired on Fuji TV from January to September 2002. It was produced by Fuji TV, Bones, Media Factory and Victor Entertainment. The series received critical acclaim and was subsequently translated, released on DVD and aired in several other countries, including the United States. An adapted movie called RahXephon: Pluralitas Concentio was directed by Tomoki Kyoda, with plot changes and a few new scenes, was released in 2003. Novels, an extra OVA episode, an audio drama, computer games, illustration books, and a somewhat tweaked manga adaptation by Takeaki Momose were also created.

Music, time, archetypal mystery, intrigues and romance are central elements of RahXephon’s plot. The series shows clear influences from philosophy and Japanese folklore, and from Western literature such as the work of James Rahxpehon – Official Illustration CollectionChurchward. Mesoamerican and other Pre-Columbian civilizations have a prominent place in the cultural background of the series. Director Izubuchi said RahXephon was his attempt to set a new standard for mecha anime, as well as to bring back aspects of 1970s mecha shows like Brave Raideen.