The 2010 1. divisjon (referred to as Adeccoligaen for sponsorship reasons) was a Norwegian second-tier football season.
HamKam, Notodden, Stavanger and Skeid were relegated to the 2. divisjon in 2009 after finishing from thirteenth to sixteenth place respectively.
At the end of the season, a two-legged promotion playoff was played between the 3rd, 4th, and 5th placed teams in the 1. divisjon and the 14th placed team in the Tippeligaen, Fredrikstad won this playoff against Hønefoss, and was promoted together with Sogndal and Sarpsborg 08.
FK Lyn elected to file for bankruptcy on 30 June,[2] following an extended period of financial distress, and formally withdrew from the league on 7 July.
[3] Pursuant to the rules and regulations of the competition, all games involving Lyn was annulled and the team placed at the bottom of the standings.