| Competition: | Hyundai Motors, Intermax K2 League |
| Season: | 2003 |
| Winners: | Goyang Kookmin Bank (1st title) |
| Matches: | 92 |
| Total Goals: | 238 |
| Biggest Home Win: | HMD 4–0 Hummel (6 September 2003) |
| Biggest Away Win: | Seosan 0–5 Seoul (19 October 2003) |
| Highest Scoring: | Gangneung 3–5 Hallelujah (19 April 2003) |
| Longest Wins: | 5 matches Goyang Kookmin Bank |
| Longest Unbeaten: | 11 matches Goyang Kookmin Bank |
| Longest Winless: | 18 matches Daejeon KHNP |
| Longest Losses: | 5 matches |
| Best Player: | First stage: Jang Hyeon-ho Second stage: Lee Do-kweon Playoff: Kim Ki-jong[1] |
| League Topscorer: | First stage: Lee Seong-gil Second stage: Lee Hyeon-dong |
| Best Goalkeeper: | First stage: Jin Sang-ol Second stage: Kim Ji-woon |
| Prevseason: | 2002 Semipro League |
| Nextseason: | 2004 |
The 2003 K2 League was the first season of the Korea National League. It was divided into two stages, and the winners of each stage qualified for the championship playoff.
----Goyang Kookmin Bank won 5–4 on aggregate.