Princess Reishi (1078–1144) was the Empress of her nephew Emperor Toba of Japan. She was the daughter of Emperor Shirakawa and Fujiwara no Kenshi (1057-1084). Her father abdicated in favor of her brother in 1087. In 1107, her brother Emperor Horikawa died and was succeeded by her four-year-old nephew, Emperor Toba. She was appointed to serve ceremoniously as the Empress of her nephew in 1108. In 1130, she ordained as a Buddhist nun.