Yoshiharu Yamaguchi (山口 良治, Yamaguchi Yoshiharu, born 15 February 1943) is a former Japanese rugby union player. He made his debut for Japan against a touring New Zealand Universities team in Osaka on 12 March 1967. He last appeared for Japan against England's under 23 team in Twickenham on 13 October 1973.

Yoshiharu Yamaguchi
Date of birth (1943-02-15) 15 February 1943 (age 81)
Place of birthMihama, Fukui, Japan
SchoolWakasa Higashi High School
UniversityNihon University
Rugby union career
Position(s) Flanker
Amateur team(s)
Years Team Apps (Points)
Nihon University RFC ()
International career
Years Team Apps (Points)
1967–1973 Japan 13 (94)

He inspired the Japanese TV series School Wars and the film School Wars: Hero which are based on his true story.

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