Yoshioyama Osamu (born 20 May 1949 as Osamu Yoshimura) is a former sumo wrestler from Yatsushiro, Kumamoto, Japan.
He made his professional debut in March 1965 and reached the top division in November 1969.
Upon retirement from active competition he became an elder in the Japan Sumo Association under the name Onogawa.
[1] Sanshō key: F=Fighting spirit; O=Outstanding performance; T=Technique Also shown: ★=Kinboshi; P=Playoff(s) Divisions: Makuuchi — Jūryō — Makushita — Sandanme — Jonidan — Jonokuchi
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