| Competition: | 2. divisjon |
| Season: | 1984 |
| Winners: | Mjøndalen Brann |
| Promoted: | Mjøndalen Brann |
| Relegated: | Brumunddal Odd Lyn Mo Varegg Nessegutten |
| Prevseason: | 1983 |
| Nextseason: | 1985 |
The 1984 2. divisjon was a Norway's second-tier football league season.
The league was contested by 24 teams, divided into two groups; A and B. The winners of group A and B were promoted to the 1985 1. divisjon.[1] The second placed teams met the 10th position finisher in the 1. divisjon in a qualification round where the winner was promoted to 1. divisjon. The bottom three teams inn both groups were relegated to the 3. divisjon.
Moss won the qualification round and remained in the 1. divisjon.