| Season | 2005 |
|---|---|
| Champions | Gamba Osaka 1st J. League title 1st Japanese title |
| Relegated | Kashiwa Reysol Tokyo Verdy 1969 Vissel Kobe |
| Champions League | Gamba Osaka Tokyo Verdy 1969 (all to the group stage) |
| Matches played | 306 |
| Goals scored | 873 (2.85 per match) |
| Top goalscorer | Clemerson (33 goals total) |
| Highest attendance | 55,476 (Round 9, Red Diamonds vs. Grampus Eight) |
| Lowest attendance | 3,267 (Round 5, Verdy 1969 vs. Sanfrecce) |
| Average attendance | 18,765 |
← 2004 2006 → | |
The 2005 season was the 13th season since the establishment of J.League. It began on March 5 and ended on December 3, followed by promotion/relegation series matches on December 7 and 10.