Sailor Galaxia (セーラーギャラクシア, Sērā Gyarakushia?) is a fictional character in the Sailor Moon universe. She appears as Sailor Moon's strongest opponent in the manga Stars and its anime counterpart, Sailor Stars.
Sailor Galaxia is the self-proclaimed "Golden Queen of Shadow Galactica" who directly commands the Sailor Animamates. Her goal is to discover all the Sailor Crystals in the universe so that she can rule the universe unopposed.
Galaxia's own crystal, the Saffer Crystal, is described as one of the most powerful Sailor Crystals in the galaxy. Its name is Old English for "sapphire," and the kanji applied to it in the text of the manga are 青金石 (seikinseki), meaning "lapis lazuli."