Kotoryū Hiroo (born 2 March 1972 as Katsumi Nakano) is a former sumo wrestler from Hyōgo, Japan.
Kotoryū was ranked in the top division for 51 tournaments over a period of nine years, earning three kinboshi, or gold stars, for defeating yokozuna.
He had been suffering from liver problems and diabetes and lost some 20 kg (44 lb) in weight, and felt he had reached his physical limit.
After retirement Kotoryū stayed on as a coach at his stable for a short time under his fighting name, but he was unable to acquire permanent toshiyori, or elder status and so left the sumo world in April 2006, to help with his father's business.
Sanshō key: F=Fighting spirit; O=Outstanding performance; T=Technique Also shown: ★=Kinboshi; P=Playoff(s) Divisions: Makuuchi — Jūryō — Makushita — Sandanme — Jonidan — Jonokuchi