The 1970-71 KNVB Cup was the 53rd edition of the Dutch national football annual knockout tournament for the KNVB Cup. 51 teams contested, beginning on 15 August 1970 and ending at the final on 20 May 1971. Ajax successfully defended its 1971 title achieving its sixth KNVB title defeating Sparta, 2–1. Sparta contested in the Cup Winners' Cup, since Ajax finished second in the Eredivisie, already qualified for the European Cup.

Teams

First round

The matches of the first round were played on 15-16 August 1970. Cupholders Ajax E received a bye for this round. E Eredivisie; 1 Eerste Divisie; 2 Tweede Divisie

Second round

The matches of the second round were played on November 8, 1970. The following clubs received a bye: Fortuna Sittard, FC Twente, Holland Sport, HFC Haarlem, Sparta Rotterdam and SC Drenthe.

Round of 16

The matches of the round of 16 were played on March 14, 1971.

Quarter finals

The quarter finals were played on April 7 and 8 1971.

Semi-finals

The semi-finals were played on April 21 and 22 1971.

Final

Replay

Sparta contested in the Cup Winners' Cup, since Ajax finished second in the Eredivisie, already qualified for the European Cup.