2004 J.League Division 2
| Season | 2004 |
|---|---|
| Champions | Kawasaki Frontale 2nd J2 title 3rd D2 title |
| Promoted | Kawasaki Frontale Omiya Ardija |
| Matches played | 264 |
| Goals scored | 635 (2.41 per match) |
| Top goalscorer | Juninho (33 goals total) |
| Highest attendance | 20,062 (Round 10, Montedio vs. Vegalta) |
| Lowest attendance | 1,338 (Round 31, HollyHock vs. Bellmare) |
| Average attendance | 7,213 |
← 2003 2005 → | |
The 2004 J. League Division 2 season was the 33rd season of the second-tier club football in Japan and the 6th season since the establishment of J2 League.
In this season, twelve clubs competed in the quadruple round-robin format. Starting this season, promotion slots increased to 2.5 slots. The top two received automatic promotion and the third-placed finisher advanced to the Pro/Rele Series for the promotion. There were no relegation to the third-tier Japan Football League.