Space Runaway Ideon (伝説巨神イデオン, Densetsu Kyojin Ideon, lit. Legendary Giant Ideon, also The Ideon) is a 1980 anime television series produced by Sunrise, created and directed by Yoshiyuki Tomino, produced immediately following his signature work, Mobile Suit Gundam. It first premiered on TV Tokyo from 1980 to 1981, followed by two feature films in 1982, and was later broadcast in Japan by the satellite TV network Animax from September 2006.

Its mechanical designs were created by Yuichi Higuchi at Studio Submarine. The television series credited only the design studio, while Higuchi received full credit for the subsequent films. The characters were designed by Tomonori Kogawa. The series won the Animage Anime Grand Prix prize for the second half of 1980.