Masurao Hiroo is a Japanese former sumo wrestler, born Hiroo Teshima 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.

Itoda is a town located in Tagawa District, Fukuoka Prefecture, Japan. As of 31 December 2023, the town had an estimated population of 8448 in 4581 households, and a population density of 830 persons per km². The total area of the town is 8.04 km2 (3.10 sq mi).