| Competition: | 2. divisjon |
| Season: | 1980 |
| Winners: | HamKam Brann |
| Promoted: | HamKam Brann Haugar |
| Relegated: | Frigg Sarpsborg FK Harstad Strindheim Hødd Os |
| Prevseason: | 1979 |
| Nextseason: | 1981 |
The 1980 2. divisjon was a Norwegian second-tier football league season.
The league was contested by 24 teams, divided into two groups; A and B.[1] Both groups consisted of 12 teams. The winners of group A and B were promoted to the 1981 1. divisjon. The second placed teams in group A and B met each other in a two-legged qualification round where the winner was promoted to 1. divisjon. The bottom three teams in both groups were relegated to the 3. divisjon.
HamKam won group A with 34 points. Brann won group B with 34 points. Both teams promoted to the 1981 1. divisjon. The second-placed teams, Mjøndalen and Haugar met in the promotion play-offs. Haugar defeated Mjøndalen with 4–0 on aggregate and won promotion.
Haugar won 4–0 on aggregate and was promoted to 1. divisjon.