| Norgesmesterskapet i fotball for herrer | |
|---|---|
| Tournament details | |
| Country |  Norway |
| Teams | 128 (main competition) |
| Defending champions | Rosenborg |
| Final positions | |
| Champions | Strømsgodset (4th title) |
| Runner-up | Rosenborg |
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.