| Competition: | 1. divisjon |
| Season: | 1989 |
| Winners: | Lillestrøm 5th title |
| Relegated: | Sogndal Mjølner |
| Continentalcup1 Qualifiers: | Lillestrøm |
| Continentalcup1: | European Cup |
| Continentalcup2: | Cup Winners' Cup |
| Continentalcup2 Qualifiers: | Viking |
| Continentalcup3 Qualifiers: | Rosenborg |
| Continentalcup3: | UEFA Cup |
| Total Goals: | 405 |
| Matches: | 132 |
| Biggest Home Win: | Molde 7–0 Mjølner (1 October 1989) |
| Biggest Away Win: | (1 October 1989) |
| Highest Scoring: | Vålerengen 2–8 Rosenborg[1] (1 October 1989) |
| Highest Attendance: | 16,753 Rosenborg 6–2 Mjølner (16 May 1989) |
| Lowest Attendance: | 554 Mjølner 3–3 Sogndal (8 October 1989) |
| League Topscorer: | Jahn Ivar "Mini" Jakobsen (18 goals) |
| Average Attendance: | 4,729 6.9% |
| Dates: | 30 April – 8 October |
| Prevseason: | 1988 |
| Nextseason: | Tippeligaen 1990 |
The 1989 1. divisjon was the 45th completed season of top division football in Norway. The season began on 30 April 1989, and ended on 8 October 1989.
22 games were played with 3 points given for wins and 1 for draws. Number eleven and twelve were relegated. The winners of the two groups of the 2. divisjon were promoted, as well as the winner of a series of play-off matches between the two second placed teams in the two groups of the 2. divisjon and number ten in the 1. divisjon.
This was the last season the top flight of Norwegian football would be called the 1. divisjon. The following year, the league changed its name to Tippeligaen, from its sponsor, Norsk Tipping.[2]
Note: Table lists in alphabetical order.
Vålerengen, Djerv 1919, and HamKam competed in the play-offs, Vålerengen won and remained in the top division.
| Rank | Player | Club | Goals |
|---|---|---|---|
| 1 |  Jahn Ivar "Mini" Jakobsen | Rosenborg | 18 |
| 2 | Karl Petter Løken | Rosenborg | 13 |
| 3 | Jostein Flo | Molde | 12 |
| 4 | Stein Berg Johansen | Mjølner | 11 |
| 5 |  Kjell Jonevret | Viking | 10 |
 Mike McCabe | Tromsø | ||
| 7 | Dag Riisnæs | Kongsvinger | 9 |
| Frank Strandli | Start | ||
| 9 | Petter Belsvik | Molde | 8 |
| Gøran Sørloth | Rosenborg | ||
| Atle Torvanger | Brann |