The 1991 Norwegian Football Cup was the 86th edition of the Norwegian Football Cup. The final took place at Ullevaal Stadion in Oslo on 20 October 1991. Strømsgodset were won the Norwegian Cup after they defeated Rosenborg with the score 3–2. This was Strømsgodset's fourth Norwegian Cup title.

Calendar Below are the dates for each round as given by the official schedule:

Round Date(s) Number of fixtures ClubsFirst Round 29–30 May 1991 64 128 → 64Second Round 11–12 June 1991 32 64 → 32Third Round 26 June 1991 16 32 → 16Fourth Round 24 July 1991 9 16 → 8Quarter-finals 14 August 1991 5 8 → 4Semi-finals 14–15 September 1991 2 4 → 2Final 20 October 1991 1 2 → 1

First round

|colspan="3" style="background-color:#97DEFF"|29 May 1991

|colspan="3" style="background-color:#97DEFF"|30 May 1991

|colspan="3" style="background-color:#97DEFF"|2 June 1991

|colspan="3" style="background-color:#97DEFF"|3 June 1991

Second round

|colspan="3" style="background-color:#97DEFF"|11 June 1991

|colspan="3" style="background-color:#97DEFF"|12 June 1991

Third round

|colspan="3" style="background-color:#97DEFF"|25 June 1991

|colspan="3" style="background-color:#97DEFF"|26 June 1991

|colspan="3" style="background-color:#97DEFF"|27 June 1991

Fourth round

Replay

Quarter-finals

Replay

Semi-finals

Final

References http://www.rsssf.no