Kōryū Tadaharu (光龍 忠晴, born 4 February 1984) is a Mongolian former sumo wrestler from Ulan Bator.

A competition was held and Erdene did sufficiently well, along with two other tryouts, later wrestlers Hoshihikari and Hoshizakura to gain acceptance into the stable.

He returned to makuuchi after an 11-4 record which included a playoff for the jūryō championship, but his fifth attempt at a winning score in the top division in the May tournament proved unsuccessful.

Koryu was one of 23 wrestlers found guilty of fixing the result of bouts after an investigation by the Japan Sumo Association, and he was forced to retire in April 2011.

Sanshō key: F=Fighting spirit; O=Outstanding performance; T=Technique     Also shown: ★=Kinboshi; P=Playoff(s) Divisions: Makuuchi — Jūryō — Makushita — Sandanme — Jonidan — Jonokuchi