Gendo Ikari is a fictional character from the Neon Genesis Evangelion franchise, created by Gainax. In the original anime series with the same name, Gendo is the supreme commander of the special agency Nerv, which is dedicated to the study and annihilation of Angels, a series of mysterious enemies of humans. Gendo is grief-stricken by the sudden death of his wife Yui, and abandons his son Shinji Ikari to devote himself to a plan named Human Instrumentality Project. Years later, Gendo asks Shinji to pilot a giant mecha named Evangelion; his pragmatic, cold, and calculating attitude leads him to use any means to achieve his personal goals. He also appears in the franchise's animated feature films and related media, video games, the original net animation Petit Eva: Evangelion@School, the Rebuild of Evangelion films, and the manga adaptation by Yoshiyuki Sadamoto.

Neon Genesis Evangelion is a Japanese media franchise created by Hideaki Anno and owned by Khara. Most of the franchise features an apocalyptic mecha action story, which revolves around the paramilitary organization NERV and their efforts in fighting hostile beings called Angels, using giant humanoids called Evangelions that are piloted by select teenagers. Subsequent works deviate from this theme to varying degrees, focusing more on romantic interactions between the characters, plotlines not present in the original works, and reimaginings of the conflicts from the original works.