| Norgesmesterskapet i fotball for herrer | |
|---|---|
| Tournament details | |
| Country |  Norway |
| Teams | 128 (main competition) |
| Defending champions | Vålerengen |
| Final positions | |
| Champions | Lillestrøm (3rd title) |
| Runner-up | Moss |
The 1981 Norwegian Football Cup was the 76th edition of the Norwegian annual knockout football tournament. The Cup was won by Lillestrøm after beating Moss in the cup final with the score 3–1. This was Lillestrøm's third Norwegian Cup title.