The 2017 3. deild karla (English: Men's Third Division) was the 5th season of fourth-tier Icelandic football in its ten team league format. The league began on 12 May and concluded on 16 September.
The league was contested by ten clubs. Eight remained in the division from the 2016 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.