The 1990–91 Copa del Rey was the 89th staging of the Spanish Cup. The competition began on 5 September 1990 and ended on 29 June 1991 with the final.
Fifth round
First leg Second leg ==Round of 16==
Round of 16
First leg Second leg ==Quarter-finals==
Quarter-finals
First leg Second leg ==Semi-finals==
Semi-finals
First leg Second leg ==Final==