Kotoinazuma Yoshihiro (born 26 April 1962 as Masahiro Tamura) is a former sumo wrestler from Niiharu, Gunma, Japan.

For his first appearance on the banzuke ranking sheets he was given the shikona of Kotoinazuma, with the prefix of Koto, the Japanese stringed instrument, used by all members of his stable, and the suffix "Inazuma" meaning "lightning.

In addition it took Kotoinazuma 100 career tournaments before he earned a special prize (an Outstanding Performance Award in September 1994), which is the most in sumo history.

He fought his final tournament in makuuchi in September 1998, by which time he was the oldest man in the top division.

This meant that the tokoyama or hairdressers had difficulty in producing the elaborate ginkgo leaf style oichomage or topknot that professional sumo wrestlers are required to wear on the dohyō.

Sanshō key: F=Fighting spirit; O=Outstanding performance; T=Technique     Also shown: ★=Kinboshi; P=Playoff(s) Divisions: Makuuchi — Jūryō — Makushita — Sandanme — Jonidan — Jonokuchi