Japan at the 2004 Summer Olympics

Three Japanese archers qualified each for the men's and women's individual archery, and a spot each for both men's and women's teams. ;Men ;Women ==Athletics ==

Japanese athletes have so far achieved qualifying standards in the following athletics events (up to a maximum of 3 athletes in each event at the 'A' Standard, and 1 at the 'B' Standard). The team was selected based on the results of the 2004 Japan Championships in Athletics. Koji Murofushi originally claimed a silver medal in men's hammer throw. On August 29, 2004, the International Olympic Committee stripped off Hungary's Adrián Annus hammer throw title after failing the doping test. Following the announcement of Annus' disqualification, Murofushi's medal was eventually upgraded to gold. ;Men ;Track & road events ;Field events ;Women ;Track & road events ;Field events ;Combined events – Heptathlon ==Badminton ==

;Men ;Women ;Mixed ==Baseball ==

;Roster Manager: 33 – Kiyoshi Nakahata Coaches: 31 – Yutaka Takagi, 32 – Yutaka Ohno ;Preliminary round {{Linescore|Compact=x {{Linescore|Compact=x {{Linescore|Compact=x {{Linescore|Compact=x {{Linescore|Compact=x {{Linescore|Compact=x {{Linescore|Compact=x ;Semifinal {{Linescore|Compact=x ;Bronze Medal Final {{Linescore|Compact=x ; Won Bronze Medal ==Basketball==

Women's tournament ;Roster ;Group play ---- ---- ---- ---- ;9th-10th Place Final ==Boxing==

Japan sent one boxer to the 2004 Olympics. ==Canoeing==

Sprint Qualification Legend: Q = Qualify to final; q = Qualify to semifinal ==Cycling==

Road Track ;Sprint ;Time trial ;Keirin ;Omnium Mountain biking ==Diving ==

Japanese divers qualified two spots each in men's springboard and women's platform. ;Men ;Women ==Equestrian==

Five fencers, two men and three women, represented Japan in 2004. ;Men ;Women ==Field hockey==

Women's tournament ;Roster ;Group play ---- ---- ---- ---- ;5th-8th Place Semifinal ;7th-8th Place Final ==Football ==

Men's tournament ;Roster ;Group play {{football box ---- {{football box ---- {{football box Women's tournament ;Roster ;Group play ---- ---- ;Quarterfinal ==Gymnastics==

Artistic ;Men ;Team ;Individual finals ;Women Rhythmic Trampoline ==Judo==

Fourteen Japanese judoka (seven males and five females) qualified for the 2004 Summer Olympics. ;Men ;Women ==Rowing==

The Japanese rowers qualified the following boats: ;Men ;Women Qualification Legend: FA=Final A (medal); FB=Final B (non-medal); FC=Final C (non-medal); FD=Final D (non-medal); FE=Final E (non-medal); FF=Final F (non-medal); SA/B=Semifinals A/B; SC/D=Semifinals C/D; SE/F=Semifinals E/F; R=Repechage ==Sailing==

Japanese sailors have qualified one boat for each of the following events. ;Men ;Women ;Open M = Medal race; OCS = On course side of the starting line; DSQ = Disqualified; DNF = Did not finish; DNS= Did not start; RDG = Redress given ==Shooting ==

Nine Japanese shooters (three men and six women) qualified to compete in the following events: ;Men ;Women ==Softball==

In the final game of the preliminary round, Yukiko Ueno of Japan pitched the first perfect game in Olympic softball history as Japan defeated China 2-0. Two days later, Japan again defeated China in the 3rd/4th semifinal to guarantee a medal. Their loss in the bronze medal game left them with the bronze. ;Team Roster ;Preliminary Round {{Linescore|Compact=x {{Linescore|Compact=x {{Linescore|Compact=x {{Linescore|Compact=x {{Linescore|Compact=x {{Linescore|Compact=x {{Linescore|Compact=x ;Semifinal {{Linescore|Compact=x ;Bronze Medal Game {{Linescore|Compact=x ; Won Bronze Medal ==Swimming ==

Japanese swimmers earned qualifying standards in the following events (up to a maximum of 2 swimmers in each event at the A-standard time, and 1 at the B-standard time): ;Men ;Women ==Synchronized swimming ==

Nine Japanese synchronized swimmers qualified a spot in the women's team. ==Table tennis==