Tosanoumi Toshio (born February 16, 1972 as Toshio Yamamoto in Aki City, Kōchi Prefecture, Japan), is a former sumo wrestler. He first reached the top division of professional sumo in 1995, winning 13 special prizes and earning 11 kinboshi or gold stars for defeating yokozuna over his long career. The highest rank he reached was sekiwake. He retired in 2010 to become a coach at his stable, Isenoumi stable under the name of Tatekawa.