Koji Yasumi (八角浩司, Yasumi Kōji) (born Tokyo, 13 July 1957) is a former Japanese rugby union player.
[4] Yasumi started his rugby career while playing for the rugby team of Hozen Senior High School, the college he attended.
After graduating, in 1985, he joined Toyota Motors to play the All-Japan Rugby Company Championship.
His first international cap was during the match against Canada, at Burnaby Lake, on 7 June 1986.
He was also part of the 1987 Rugby World Cup squad, playing only the match against USA, where USA won against Japan for 21-18.