Ōnishiki Ittetsu (born 11 September 1953 as Morio Obori) is a former sumo wrestler from Sado, Niigata, Japan.
He retired in January 1988 and became an elder in the Japan Sumo Association under the name Yamashina, holding the Special Executive position.
He worked as a coach at Dewanoumi stable and as a member of the Japan Sumo Association′s board of directors, holding the Special Executive position.
His favourite kimarite or techniques were yori kiri (force out) and uwatenage (overarm throw).
Sanshō key: F=Fighting spirit; O=Outstanding performance; T=Technique Also shown: ★=Kinboshi; P=Playoff(s) Divisions: Makuuchi — Jūryō — Makushita — Sandanme — Jonidan — Jonokuchi