Results for Japan in 100 metres Breaststroke, Men

Olympic and Intercalated results only.

Games	Athlete/Team	Placement
1968 Summer Olympics	Osamu Tsurumine	16
	Nobutaka Taguchi	DQ
1972 Summer Olympics	Nobutaka Taguchi	1	Gold
1976 Summer Olympics	Nobutaka Taguchi	12
	Tateki Shinya	20
1984 Summer Olympics	Shigehiro Takahashi	10
	Kenji Watanabe	27
1988 Summer Olympics	Hironobu Nagahata	13
	Kenji Watanabe	18
1992 Summer Olympics	Akira Hayashi	4
	Kenji Watanabe	18
1996 Summer Olympics	Akira Hayashi	12
	Yoshinobu Miyazaki	22
2000 Summer Olympics	Kosuke Kitajima	4
	Akira Hayashi	21
2004 Summer Olympics	Kosuke Kitajima	1	Gold
2008 Summer Olympics	Kosuke Kitajima	1	Gold
	Yuta Suenaga	13
2012 Summer Olympics	Kosuke Kitajima	5
	Ryo Tateishi	10
2016 Summer Olympics	Yasuhiro Koseki	6
	Ippei Watanabe	18
2020 Summer Olympics	Ryuya Mura	13
	Shoma Sato	23
2024 Summer Olympics	Taku Taniguchi	19