The 2004 Japan Football League (Japanese: 第6回日本フットボールリーグ, Hepburn: Dai Rokkai Nihon Futtobōru Rīgu) was the sixth season of the Japan Football League, the third tier of the Japanese football league system.
It was contested by 16 teams, and Otsuka Pharmaceuticals won the championship.
Source: [citation needed]Notes:† Team played previous season in Regional Leagues.
Because of promotion of Otsuka Pharmaceuticals and Thespa Kusatsu and expulsion of Kokushikan University, no relegation has occurred.
After the season, Honda Lock, Mitsubishi Motors Mizushima and Ryutsu Keizai University were promoted from Regional Leagues by the virtue of their placing in the Regional League promotion series.