The 2006 Norwegian First Division season (known as Adeccoligaen for sponsorship reasons) kicked off on April 9, 2006, with eleven rounds being played before the World Cup break on June 5. The league resumed on July 2 and the final round was played on November 5, 2006.
Strømsgodset were promoted to the Norwegian Premier League 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 Premier League after being relegated in 2005.
P = Matches played; W = Matches won; D = Matches drawn; L = Matches lost; F = Goals for; A = Goals against; GD = Goal difference; Pts = Points
The winners and runners-up of Adeccoligaen are automatically promoted to the Norwegian Premier League. The third-placed team in Adeccoligaen and the 12th-placed team in Tippeligaen meet in a playoff at the end of the season. The four teams finishing at the bottom of the table are automatically relegated to the 2nd Division.