| Country: | South Korea |
| Num Teams: | 4 |
| Champion Other: | Ulsan Hyundai Horang-i |
| Second Other: | Incheon United |
| Matches: | 4 |
| Goals: | 14 |
| Top Scorer: | Lee Chun-soo (4 goals) |
| Prevseason: | 2004 |
| Nextseason: | 2006 |
The 2005 K League Championship was the ninth competition of the K League Championship, and was held to decide the 23rd champions of the K League. After the regular season was finished, the first stage winners, the second stage winners, and the top two clubs in the overall table qualified for the championship. Each semi-final was played as a single match, and the final consisted of two matches.
See main article: 2005 K League.
| Club | Placement | |
|---|---|---|
| Busan IPark | First stage winners | |
| Seongnam Ilhwa Chunma | Second stage winners Overall table 2nd place | |
| Incheon United | Overall table 1st place | |
| Ulsan Hyundai Horang-i | Overall table 3rd place |
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Ulsan Hyundai Horang-i won 6–3 on aggregate.
See main article: 2005 K League.