A | B | C | D | E | F | G | H | CH | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
| Season | 2005 |
|---|---|
| Dates | Regular season: 15 May – 9 November 2005 Championship: 20 November – 4 December 2005 |
| Champions | Ulsan Hyundai Horang-i (2nd title) |
| Champions League | Ulsan Hyundai Horang-i Jeonbuk Hyundai Motors |
| Matches played | 156 |
| Goals scored | 373 (2.39 per match) |
| Best Player | Lee Chun-soo |
| Top goalscorer | Leandro Machado (13 goals) |
← 2004 2006 → | |
The 2005 K League was the 23rd season of the K League. It kicked off on May 15, and was finished on 4 December. The format of the regular season and championship playoffs was the same as the one used in the 2004 season.
Busan IPark won the first stage, and the second stage was won by Seongnam Ilhwa Chunma. Two winners were guaranteed their slot in the end-of-season playoffs. Incheon United and Ulsan Hyundai Horang-i also joined the playoffs according to the overall table after two stages. In the semi-finals Ulsan defeated Seongnam 2–1, and Incheon defeated Busan 2–0. The two victorious teams faced each other in the two-legged championship final. Ulsan won the first leg 5–1 at the Incheon stadium, and though Incheon won the second leg 2–1, Ulsan lifted their second league title 6–3 on aggregate.
Regular season
First stage
The first place team qualified for the championship playoffs.
| Pos | Team | Pld | W | D | L | GF | GA | GD | Pts | Qualification |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Busan IPark | 12 | 7 | 4 | 1 | 17 | 10 | +7 | 25 | Qualification for the playoffs |
| 2 | Incheon United | 12 | 7 | 3 | 2 | 20 | 13 | +7 | 24 | |
| 3 | Ulsan Hyundai Horang-i | 12 | 7 | 1 | 4 | 16 | 13 | +3 | 22 | |
| 4 | Pohang Steelers | 12 | 6 | 3 | 3 | 14 | 11 | +3 | 21 | |
| 5 | FC Seoul | 12 | 5 | 4 | 3 | 22 | 19 | +3 | 19 | |
| 6 | Seongnam Ilhwa Chunma | 12 | 4 | 4 | 4 | 18 | 15 | +3 | 16 | |
| 7 | Bucheon SK | 12 | 4 | 4 | 4 | 10 | 10 | 0 | 16 | |
| 8 | Daejeon Citizen | 12 | 2 | 8 | 2 | 11 | 11 | 0 | 14 | |
| 9 | Suwon Samsung Bluewings | 12 | 3 | 5 | 4 | 18 | 19 | −1 | 14 | |
| 10 | Jeonnam Dragons | 12 | 3 | 5 | 4 | 13 | 14 | −1 | 14 | |
| 11 | Jeonbuk Hyundai Motors | 12 | 2 | 3 | 7 | 13 | 19 | −6 | 9 | |
| 12 | Daegu FC | 12 | 2 | 3 | 7 | 14 | 25 | −11 | 9 | |
| 13 | Gwangju Sangmu Bulsajo | 12 | 1 | 3 | 8 | 16 | 23 | −7 | 6 |
Second stage
The first place team qualified for the championship playoffs.
| Pos | Team | Pld | W | D | L | GF | GA | GD | Pts | Qualification |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Seongnam Ilhwa Chunma | 12 | 8 | 3 | 1 | 22 | 9 | +13 | 27 | Qualification for the playoffs |
| 2 | Bucheon SK | 12 | 8 | 2 | 2 | 16 | 8 | +8 | 26 | |
| 3 | Daegu FC | 12 | 6 | 3 | 3 | 15 | 11 | +4 | 21 | |
| 4 | Ulsan Hyundai Horang-i | 12 | 6 | 3 | 3 | 15 | 11 | +4 | 21 | |
| 5 | Incheon United | 12 | 6 | 3 | 3 | 16 | 13 | +3 | 21 | |
| 6 | Pohang Steelers | 12 | 5 | 4 | 3 | 14 | 11 | +3 | 19 | |
| 7 | Daejeon Citizen | 12 | 4 | 4 | 4 | 8 | 9 | −1 | 16 | |
| 8 | Suwon Samsung Bluewings | 12 | 3 | 5 | 4 | 11 | 13 | −2 | 14 | |
| 9 | FC Seoul | 12 | 3 | 4 | 5 | 15 | 13 | +2 | 13 | |
| 10 | Jeonnam Dragons | 12 | 4 | 1 | 7 | 10 | 15 | −5 | 13 | |
| 11 | Gwangju Sangmu Bulsajo | 12 | 3 | 2 | 7 | 7 | 15 | −8 | 11 | |
| 12 | Jeonbuk Hyundai Motors | 12 | 2 | 3 | 7 | 11 | 22 | −11 | 9 | |
| 13 | Busan IPark | 12 | 0 | 3 | 9 | 11 | 21 | −10 | 3 |
Overall table
The top two teams in the overall table qualified for the championship playoffs.