Yasuharu Kawase (河瀬泰治, Kawase Yasuharu), (born Osaka, 15 June 1959) is a former Japanese rugby union player who played as flanker.
Hailing from Osaka Prefecture, Yasuharu Kawase attended high school at the Osaka Institute of Technology and graduated from Meiji University.
In the professional league, Kawase played his entire career for Toshiba Fuchu, as well for Osaka Teachers Rugby Football Team.
Kawase earned his first cap for Japan in 1982 against New Zealand Universities in Pukekohe on 30 May 1982.
He was also part of the 1987 Rugby World Cup roster, playing only in the pool match against Australia in Sydney on 3 June 1987, which marked his last cap for Japan.