The Belgian Cup 2008–09 was the 54th season of the main knockout football competition in Belgium.
In the first two rounds, teams from the provincial leagues and promotion division played each other.
Teams from the Belgian First Division 2008–09Jupiler Pro League entered the competition at this stage.
The draw for the seventh round and the quarterfinals was made on November 21, 2008.
The matches Kortrijk–KV Mechelen and Roeselare–Cercle Brugge were postponed to 17 February due to insufficient pitch conditions.