Kazuhiro Mizoguchi (溝口 和洋, Mizoguchi Kazuhiro, born March 18, 1962 in Shirahama, Wakayama, Japan) is a Japanese former javelin thrower. He set the world best year performance in 1989, throwing 87.60 metres at a meet in San Jose, California, United States on May 27, 1989. Initially, it was announced as a new world record of 87m86, 20cm higher than the previous world record, but the measurer re-measured it with a plastic tape measure and announced it as 87m60.

International competitions

Representing  Japan

Year	Competition	Venue	Position	Notes
1983	Asian Championships	Kuwait City, Kuwait	2nd
1984	Olympic Games	Los Angeles, United States	20th	74.82 m
1985	Asian Championships	Jakarta, Indonesia	3rd
1986	Asian Games	Seoul, South Korea	1st
1987	World Championships	Rome, Italy	6th	80.24 m
1988	Olympic Games	Seoul, South Korea	19th	77.46 m
1990	Asian Games	Beijing, China	3rd
1991	World Championships	Tokyo, Japan	29th	73.78 m
1995	World Championships	Gothenburg, Sweden	34th	68.66 m