Semi-finals
| Busan IPark | 0–2 | Incheon United |
|---|---|---|
| Report |
|
Attendance: 13,475
| Seongnam Ilhwa Chunma | 1–2 | Ulsan Hyundai Horang-i |
|---|---|---|
Nam Ki-il  18' | Report |
|
Attendance: 12,427
| Tournament details | |
|---|---|
| Host country | South Korea |
| Dates | 20 November – 4 December 2005 |
| Teams | 4 |
| Final positions | |
| Champions | Ulsan Hyundai Horang-i |
| Runners-up | Incheon United |
| Tournament statistics | |
| Matches played | 4 |
| Goals scored | 14 (3.5 per match) |
| Attendance | 95,910 (23,978 per match) |
| Top scorer(s) | Lee Chun-soo (4 goals) |
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.
| 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 |
| Semi-finals | Final | ||||||||||
| Busan IPark | 0 | ||||||||||
| Incheon United | 2 | ||||||||||
| Incheon United | 1 | 2 | 3 | ||||||||
| Ulsan Hyundai Horang-i | 5 | 1 | 6 | ||||||||
| Seongnam Ilhwa Chunma | 1 | ||||||||||
| Ulsan Hyundai Horang-i | 2 | ||||||||||
| Busan IPark | 0–2 | Incheon United |
|---|---|---|
| Report |
|
| Seongnam Ilhwa Chunma | 1–2 | Ulsan Hyundai Horang-i |
|---|---|---|
| Nam Ki-il 18' | Report |
|
| Incheon United | 1–5 | Ulsan Hyundai Horang-i |
|---|---|---|
| Radončić 89' | Report |
|
| Ulsan Hyundai Horang-i | 1–2 | Incheon United |
|---|---|---|
| Choi Sung-kuk 18' | Report | Radončić 14', 26' |
Ulsan Hyundai Horang-i won 6–3 on aggregate.
| Pos | Team | Qualification | |
|---|---|---|---|
| 1 | Ulsan Hyundai Horang-i (C) | Qualification for the Champions League | |
| 2 | Incheon United | ||
| 3 | Seongnam Ilhwa Chunma | ||
| 4 | Busan IPark |
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