The 2013 3. deild karla (English: Men's Third Division) was the 32nd season of fourth-tier football in Iceland. Ten teams contested the league, which as of 2013 is no longer the lowest division in Iceland following the restructuring of the league pyramid. The fixtures for the 2013 campaign were released by the KSÃÂ on 10 November 2012; play began on 17 May and concluded on 14 September.
The previous season the division was the lowest one in Iceland, but starting this season the 4. deild will be beneath the 3. deild. 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. There are two new clubs from the previous campaign, with eight remaining of the 30 teams that competed last year, with those not mentioned below either competing in the new 4. deild or not competing this season.
Each team plays every opponent once home and away for a total of 18 matches per club, and 90 matches altogether.