Ultraman Geist (ウルトラマンガイスト Urutoraman Gaisuto) is a dark clone of Ultraman.
Geist is the German word for "Ghost".
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Ultraman Geist was created alongside Ultraseven Geist by Imitation Ultraman after he tricked Tiga into surrendering his power of light and merge it with the grudges of past monsters. Alongside Seven Geist, it was defeated by Tiga and Ultraman Zero.
- The Ultraman Geist suit was used to portray the corrupted form of Ultraman, Ultraman Dark, who appeared in Ultraman Ginga.