| Competition: | 1. divisjon |
| Season: | 1965 |
| Winners: | Vålerengen 1st title |
| Relegated: | Viking Sandefjord BK |
| Continentalcup1: | European Cup |
| Continentalcup1 Qualifiers: | Vålerengen |
| Continentalcup2: | Cup Winners' Cup |
| Continentalcup2 Qualifiers: | Skeid |
| Continentalcup3: | Inter-Cities Fairs Cup |
| Continentalcup3 Qualifiers: | Frigg |
| Matches: | 90 |
| Total Goals: | 307 |
| League Topscorer: | Harald Berg (19 goals) |
| Biggest Home Win: | (17 August 1965) |
| Biggest Away Win: | (4 August 1965) |
| Highest Scoring: | (17 August 1965) |
| Longest Wins: | Sarpsborg FK (6 games) |
| Longest Unbeaten: | Fredrikstad Frigg Sarpsborg FK Vålerengen (7 games) |
| Longest Winless: | Sandefjord BK (18 games) |
| Longest Losses: | Sandefjord BK (9 games) |
| Highest Attendance: | 17,063 (14 May 1965) |
| Lowest Attendance: | 400 (3 October 1965) |
| Average Attendance: | 5,034 18.6% |
| Dates: | 23 April – 10 October |
| Prevseason: | 1964 |
| Nextseason: | 1966 |
The 1965 1. divisjon was the 21st completed season of top division football in Norway.
The season was contested by 10 teams, and Vålerengen won their first championship.
Vålerenga's 27 points was at the time a record for most points in a season, one more than Lyn achieved in the previous season. Viking and Sandefjord BK were relegated to the 2. divisjon.
Note: Table lists in alphabetical order.
| Team | Location | ||
|---|---|---|---|
| Fredrikstad | 20 | Fredrikstad | |
| Frigg | 10 | Oslo | |
| Lyn | 13 | Oslo | |
| Odd | 16 | Skien | |
| Sandefjord BK | 18 | Sandefjord | |
| Sarpsborg FK | 15 | Sarpsborg | |
| Skeid | 19 | Oslo | |
| Steinkjer | 7 | Steinkjer | |
| Vålerengen | 16 | Oslo | |
| Viking | 20 | Stavanger |
Harald Berg, Lyn – 19 goals