The 1983-84 KNVB Cup was the 66th edition of the Dutch national football annual knockout tournament for the KNVB Cup. 46 teams contested, beginning on 8 October 1983 and ending at the final on 2 May 1984.
Feyenoord beat Fortuna Sittard 1–0 and won the cup for the sixth time. Replays were held if teams were tied after ninety minutes.