Musōyama Masashi (born February 14, 1972 as Takehito Oso) is a former sumo wrestler from Mito, Ibaraki, Japan. A former amateur champion, he turned professional in January 1993, and he won promotion to the top makuuchi division in just four tournaments. He won thirteen special prizes and spent a total of 31 tournaments at komusubi and sekiwake before finally reaching the second highest rank of ōzeki in 2000, shortly after winning his only top division tournament championship or yūshō. He retired in 2004. He is now the head coach of Fujishima stable.