| Competition: | 2. Bundesliga |
| Season: | 2003–04 |
| Winners: | 1. FC Nürnberg |
| Promoted: | 1. FC Nürnberg Arminia Bielefeld Mainz 05 |
| Relegated: | VfB Lübeck Jahn Regensburg Union Berlin VfL Osnabrück |
| League Topscorer: | Francisco Copado Marek Mintál (18 goals each) |
| Prevseason: | 2002–03 |
| Nextseason: | 2004–05 |
The 2003–04 2. Bundesliga was the 30th season of the 2. Bundesliga, the second tier of the German football league system. 1. FC Nürnberg, Arminia Bielefeld and Mainz 05 were promoted to the Bundesliga while VfB Lübeck, Jahn Regensburg, Union Berlin and VfL Osnabrück were relegated to the Regionalliga.
For the 2003–04 season SSV Jahn Regensburg, SpVgg Unterhaching, Erzgebirge Aue and VfL Osnabrück were newly promoted to the 2. Bundesliga from the Regionalliga while Arminia Bielefeld, 1. FC Nürnberg and FC Energie Cottbus had been relegated to the league from the Bundesliga.[1]
The league's top scorers:[2]