| Season | 2004 |
|---|---|
| Dates | Regular season: 3 April – 20 November 2004 Championship: 5–12 December 2004 |
| Champions | Suwon Samsung Bluewings (3rd title) |
| Champions League | Suwon Samsung Bluewings Busan I'Cons |
| Matches played | 156 |
| Goals scored | 297 (1.9 per match) |
| Best Player | Nádson |
| Top goalscorer | Mota (14 goals) |
← 2003 2005 → | |
The 2004 K League was the 22nd season of the K League. The previous single format of the league was replaced by two regular stages and playoffs in this season. Each team played a total of 12 matches against every other team in each stage. After both stages were finished, two winners and the top two clubs in the overall table qualified for the playoffs.