| Competition: | Belgian First Division |
| Season: | 2003–04 |
| Winners: | Anderlecht |
| Relegated: | Heusden-Zolder Antwerp |
| Continentalcup1: | Champions League |
| Continentalcup1 Qualifiers: | Anderlecht Club Brugge |
| Continentalcup2: | UEFA Cup |
| Continentalcup2 Qualifiers: | Standard Liège Beveren |
| League Topscorer: | Luigi Pieroni (28 goals) |
| Matches: | 306 |
| Total Goals: | 824 |
| Prevseason: | 2002–03 |
| Nextseason: | 2004–05 |
The 2003–04 season of the Belgian First Division was held between 8 August 2003 and 15 May 2004. Sporting Anderlecht became champions on 24 April 2004.
These teams were promoted from the second division at the start of the season:
These teams were relegated to the second division at the end of the season:
The battle for the title was not great as Anderlecht had a big lead over their opponents (mainly Club Brugge). However, a bad finish from Anderlecht kept the suspense until the 31st matchday when Club Brugge drew with Mouscron while the team from Brussels also drew (1-1) at Herman Vanderpoortenstadion, the homeground of Lierse.
The next week, Club Brugge was sure to enter the UEFA Champions League Preliminary Round with a 1-0 win against Standard Liège, then lying third. In spite of this defeat, Standard managed to qualify for the UEFA Cup as they were 6 points ahead of Mouscron after the 32nd matchday. The suspense was killed after a 1-1 draw against Charleroi the next Saturday.
The end of the league was thus centered on the battle against relegation. Four teams were concerned : R.A.E.C. Mons and Charleroi, which finally saved themselves, R. Antwerp F.C. and K. Beringen-Heusden-Zolder finishing respectively 6 and 5 points adrift.
