| Season | 2009 |
|---|---|
| Champions | Kashima Antlers 7th J. League title 7th Japanese title |
| Relegated | Kashiwa Reysol JEF United Chiba Oita Trinita |
| Champions League | Kashima Antlers Kawasaki Frontale Gamba Osaka Sanfrecce Hiroshima (all to the group stage) |
| Matches played | 306 |
| Goals scored | 791 (2.58 per match) |
| Top goalscorer | Ryoichi Maeda (20 goals total) |
| Highest attendance | 53,783 (Round 34, Red Diamonds vs. Antlers) |
| Lowest attendance | 5,567 (Round 12, Sanga vs. JEF United) |
| Average attendance | 18,985 |
← 2008 2010 → | |
The 2009 J.League Division 1 season is the 45th season of the top-flight club football in Japan and the 17th season since the establishment of J1 League. The season started on March 7, 2009 and ended on December 5, 2009.
A total of eighteen clubs participated in double round-robin format. At the end of the season, top three clubs received automatic qualification to the following years' AFC Champions League. Also starting this season, the bottom three clubs were relegated to J2 League by default.
Kashima Antlers became the first Japanese club win J.League Championship in three straight seasons.