Results for Japan in Decathlon, Men

Olympic and Intercalated results only.

Games	Athlete/Team	Placement
1920 Summer Olympics	Gensabulo Noguchi	12
1924 Summer Olympics	Tokushige Noto	22
	Mikio Oda	DNS
	Seiichi Ueda	DNS
1928 Summer Olympics	Tatsuo Toki	12
	Yonetaro Nakazawa	22
	Mikio Oda	DNS
1932 Summer Olympics	Shuhei Nishida	DNS
1936 Summer Olympics	Yoshiro Asakuma	DNS
	Sueo Oe	DNS
1960 Summer Olympics	Fumio Nishiuchi	DNS
1964 Summer Olympics	Shosuke Suzuki	15
2012 Summer Olympics	Keisuke Ushiro	20
2016 Summer Olympics	Keisuke Ushiro	20
	Akihiko Nakamura	22