Ryūō Noboru (born March 11, 1983, as Erkhem-Ochiryn Sanchirbold, Mongolian: Эрхэм-Очирын Санчирболд) is a former professional sumo wrestler from Ulan-Bator, Mongolia.

He took part in a seven way play-off for the title in the third makushita division in January 2003, but his progress was slowed by a neck injury that forced him to sit out the November 2003 tournament.

In September 2010 he was rebuked by the Japan Sumo Association for visiting the locker room of Hakuhō's opponent, Aran, prior to the match.

He was presented with a specially-made “kantosho” trophy by Hakuhō to make up for the fact that he missed out on the Fighting Spirit Award in his top division debut despite ten wins.

[3] Unlike most of his Mongolian compatriots, Ryūō specialised in pushing rather than throwing techniques and he was noted for his strong tachi-ai, or opening charge at the beginning of matches.