The 2011 1. division (referred to as Adeccoligaen for sponsorship reasons) was a Norwegian second-tier football season.
The season began play on 3 April 2011 and ended on 30 October 2011.
Following an extended period of financial distress, Lyn withdrew from the league in 2010.
[2] Follo did not finish their licensing application for the 2011 season before the time limit of 15 September 2010, and were thus relegated at the end of the 2010 season even though they finished 12th, outside of the relegation zone.
†Remond Mendy scored nine goals in fifteen games for Nybergsund IL-Trysil.