| Competition: | 1. divisjon |
| Season: | 1966 |
| Winners: | Skeid 1st title |
| Relegated: | Lisleby Hødd |
| Continentalcup1: | European Cup |
| Continentalcup1 Qualifiers: | Skeid |
| Continentalcup2: | Cup Winners' Cup |
| Continentalcup2 Qualifiers: | Fredrikstad |
| Continentalcup3: | Inter-Cities Fairs Cup |
| Continentalcup3 Qualifiers: | Lyn |
| Matches: | 90 |
| Total Goals: | 268 |
| League Topscorer: | Per Kristoffersen (20 goals) |
| Biggest Home Win: | (23 October 1966) |
| Biggest Away Win: | (8 May 1966) (23 October 1966) (15 October 1966) |
| Highest Scoring: | (15 May 1966) |
| Longest Wins: | Vålerengen (5 games) |
| Longest Unbeaten: | Skeid (8 games) |
| Longest Winless: | Sarpsborg FK (7 games) |
| Longest Losses: | Hødd Lisleby Odd Sarpsborg FK Steinkjer Vålerengen (3 games) |
| Highest Attendance: | 12,452 (3 June 1966) |
| Lowest Attendance: | 800 (19 June 1966) |
| Average Attendance: | 4,592 8.8% |
| Dates: | 22 April – 23 October |
| Prevseason: | 1965 |
| Nextseason: | 1967 |
The 1965 1. divisjon was the 22nd completed season of top division football in Norway.
It was contested by 10 teams, and Skeid won the championship, their first title. Both newcomers, Lisleby and Hødd, were relegated back to the 2. divisjon.
Note: Table lists in alphabetical order.
| Team | Location | ||
|---|---|---|---|
| Fredrikstad | 21 | Fredrikstad | |
| Frigg | 11 | Oslo | |
| Hødd | 1 | Ulsteinvik | |
| Lisleby | 7 | Fredrikstad | |
| Lyn | 14 | Oslo | |
| Odd | 17 | Skien | |
| Sarpsborg FK | 16 | Sarpsborg | |
| Skeid | 20 | Oslo | |
| Steinkjer | 8 | Steinkjer | |
| Vålerengen | 17 | Oslo |
Per Kristoffersen, Fredrikstad – 20 goals