| Competition: | Hyundai Motors K2 League |
| Season: | 2005 |
| Winners: | Incheon Korail (1st title) |
| Best Player: | Chung Seok-keun[1] |
| League Topscorer: | Kim Han-won (11 goals) |
| Matches: | 55 |
| Total Goals: | 262 |
| Prevseason: | 2004 |
| Nextseason: | 2006 |
The 2005 K2 League was the third season of the Korea National League. It was divided into two stages, the First stage and Second stage, and the winners of each stage are qualified for the championship playoff.
-----Incheon Korail won 4–2 on aggregate.