The 2013 3. deild karla (English: Men's Third Division) was the 32nd season of fourth-tier football in Iceland.
The fixtures for the 2013 campaign were released by the KSÍ on 10 November 2012;[1] play began on 17 May and concluded on 14 September.
As a result, the 30 teams competing in the division last season were not just competing for two promotion places to 2. deild, but also for eight offered places in the 2013 season of the 3. deild.
As a result, the remaining 20 teams were "relegated" to the new 4. deild for the 2013 season, although a couple of teams quit and a few new ones joined, as had always been the case with the 3. deild when it was the lowest division in Iceland.
The league was contested by ten clubs, eight of which played in the division during the 2012 season.