The 2017–18 3. Liga was the 25th season of the third-tier football league of Slovakia since its establishment in 1993. The league is composed of 66 teams divided in four groups of 16 teams each; only 3. liga Západ (West) includes 18 teams. Teams are divided into four divisions: 3. liga Bratislava, 3. liga Západ (West), 3. liga Stred (Central), 3. liga Východ (Eastern), according to geographical separation.
Source: III. liga Bratislava (S3BA) Rules for classification: 1) points; 2) goal difference; 3) number of goals scored. (C) Champions; (P) Promoted; (R) Relegated Notes:
Source: TIPOS III. liga ZsFZ Rules for classification: 1) points; 2) goal difference; 3) number of goals scored. (C) Champions; (P) Promoted; (R) Relegated