The 2004 Nippon Professional Baseball season ended with the Seibu Lions defeating the Chunichi Dragons in the 2004 Japan Series. This season also saw the first and only players strike in Japanese professional baseball history. Players went on strike for two days in September because of the potential mergers and realignment.

Format

Central League

Pacific League

Japan Series

Standings

Note:Two games for each team are cancelled due to players' strike

Central League

Regular season

Pacific League

Regular season

Playoff 1st Stage

Seibu Lions (2) vs. Hokkaido Nippon-Ham Fighters (1)

Playoff 2nd Stage

Fukuoka Daiei Hawks (2) vs. Seibu Lions (3)

Japan Series

Chunichi Dragons (3) vs. Seibu Lions (4)