Sailor Mars (セーラーマーズ Sērā Māzu) is one of the central characters in the Sailor Moon metaseries. Her real name is Rei Hino (火野 レイ Hino Rei, or Raye Hino in the English versions), a Shinto priestess and schoolgirl who can transform into one of the series' specialized heroines, the Sailor Senshi.
Sailor Mars is the third member of the Sailor Senshi to be discovered by Sailor Moon, after Sailor Mercury, and is the secondary leader of the Guardian (or "Inner") Senshi after Sailor Venus. She manipulates fire and heat, and has various psychic abilities related to her role as a miko in the Shinto shrine where she lives.
Aside from the main body of the Sailor Moon series, Rei features in two different manga short stories. The first, Casablanca Memories, is entirely about her and her past; the second, Rei and Minako's Girls School Battle, is shared with Minako Aino. A number of image songs featuring her character have been released as well, including the contents of three different CD singles.