Xuanwu or Xuan Wu may refer to:
Mythology Black Tortoise or Turtle, one of the Four Symbols of Chinese astronomy Xuanwu (god) ("Dark Warrior"), a god in Chinese religion
People Emperor Xuanwu of Northern Wei
Geography Xuanwu District, Beijing, China Xuanwu District, Nanjing, Jiangsu, China Xuanwu Lake in Nanjing, China Xuanwu, Luyi County, a town in Luyi County, Henan, in China