The 2002–03 KNVB Cup was the 85th edition of the tournament. The competition started on 6 August 2002 and the final was played on 1 June 2003. FC Utrecht won the cup for the second time by beating Feyenoord 4–1. A total of 86 clubs participated.
All 18 participants of the Eredivisie 2002-03: six teams entering in the round of 16 of the knock-out round; one in the first round of the knock-out round and the rest in the group stage
The matches of the first round were played on November 5 and 6, 2002. Eredivisie clubs NAC Breda and Willem II entered the tournament this round. During the group stage, they were still active in the Intertoto Cup.
The matches were played on February 4 and 5, 2003. The six Eredivisie clubs that had been active in European competitions after qualification last season entered the tournament this round.