The 2011 season of the 3. divisjon, the fourth highest association football league for men in Norway.
Between 22 and 26 games (depending on group size) are played in 12 groups, with 3 points given for wins and 1 for draws. Twelve group winners are promoted to the 2. divisjon.
The 3. divisjon was streamlined to only 12 groups, compared to 24 groups in 2010.