The 2018 3. deild karla (English: Men's Third Division) was the 6th season of fourth-tier Icelandic football in its ten team league format.
The league began on 11 May and concluded on 15 September.
[1] The league was contested by ten clubs.
Six remained in the division from the 2017 season, while four new clubs joined the 3. deild karla: Each team plays every opponent once home and away for a total of 18 matches per club, and 90 matches altogether.