2003–04 R.S.C. Anderlecht season

During the 2003–04 season, R.S.C. Anderlecht participated in the Belgian First Division.

Season summary
Anderlecht won the title for the first time in three seasons. They had held a big lead over their title rivals Club Brugge for some time, but 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 Lierse to confirm their title.

Second qualifying round
Anderlecht won 3–2 on aggregate.

Third qualifying round
Anderlecht won 4–1 on aggregate.