The 2010 1. divisjon (referred to as Adeccoligaen for sponsorship reasons) was a Norwegian second-tier football season. The season began play on 5 April 2010 and ended on 7 November 2010. The clubs relegated from the Tippeligaen in 2009 were Fredrikstad (after relegation play-offs), Bodø/Glimt and Lyn. HamKam, Notodden, Stavanger and Skeid were relegated to the 2. divisjon in 2009 after finishing from thirteenth to sixteenth place respectively. Strømmen, Follo, Sandnes Ulf and Ranheim were promoted from the 2. divisjon in 2009.