Masurao Hiroo (益荒雄広生, born June 27, 1961) is a Japanese former sumo wrestler, born Hiroo Teshima (手島 広生, Teshima Hiroo) in Itoda, Fukuoka Prefecture. Making his professional debut in 1979, he reached the top division in 1985. His highest rank was sekiwake and he won five special prizes in his top division career. He was one of the lightest wrestlers in the top division, and very popular with tournament crowds. In his later career he suffered from a number of injuries, particularly to his knee, and he retired in 1990 at the age of 29. He was the head coach of Ōnomatsu stable and a director of the Japan Sumo Association until 2019 when he left for health reasons.