| Competition: | 1. divisjon |
| Season: | 2006 |
| Dates: | 9 April – 5 November |
| Winners: | Strømsgodset |
| Promoted: | Strømsgodset Aalesund |
| Relegated: | Tromsdalen Pors Grenland Manglerud Star Follo |
| Matches: | 240 |
| Total Goals: | 806 |
| League Topscorer: | Mattias Andersson (19 goals) |
| Prevseason: | 2005 |
| Nextseason: | 2007 |
The 2006 1. divisjon season (referred to as Adeccoligaen for sponsorship reasons) was a Norwegian second-tier football season. The season kicked off on 9 April 2006, with eleven rounds being played before the World Cup break on 5 June. The league resumed on 2 July and the final round was played on 5 November 2006.
Strømsgodset were promoted to the Tippeligaen as First Division winners, along with Aalesund who finished second. Strømsgodset will be playing in the top division for the first time since 2001. Aalesund, meanwhile, return to Tippeligaen after being relegated in 2005.
| Rank | Player | Club | Goals | |
|---|---|---|---|---|
| 1 | 19 | |||
| 2 |  Håvard Sakariassen | Bryne | 18 | |
| 3 | Thomas Sørum | Manglerud Star | 15 | |
| 4 | Mohammed Ahamed | Tromsdalen | 15 | |
| 5 | Aalesund | 14 | ||
| Tore Andreas Gundersen | Kongsvinger | |||
| Lars Lafton | Hønefoss | |||
| Ørjan Låstad | Løv-Ham | |||
| 9 | Randall Brenes | Bodø/Glimt | 13 |
These two teams were relegated from the Tippeligaen in 2005. 12th-place finishers Molde defeated Moss in the playoff to retain their spot in the highest division.
These four teams were promoted from the 2. divisjon in 2005: