1966 Norwegian Second Division

The 1966 2. divisjon was a Norwegian second-tier football league season.

The league was contested by 16 teams, divided into two groups; A and B. The winners of group A and B were promoted to the 1967 1. divisjon. The two lowest placed teams in both groups were relegated to the 3. divisjon.

Summary
Strømsgodset won group A with 20 points. Rosenborg won group B with 25 points. Both teams were promoted to the 1967 1. divisjon.