The 2015–16 Slovenian Third League was divided into four regional groups with a total of 52 participating clubs. Three groups (i.e. North, Centre, East) were composed of 14 clubs, while the group West only had 10 clubs that were participating in the competition. The winners of the regular season in each group played a promotional
two-legged play-offs to decide which two teams promoted to the
Slovenian Second League. Reserve teams of the
top division sides were ineligible to promote to the second division, due to the rules of the
Football Association of Slovenia, which stipulated that one club's main squad and their reserve team must be at least two leagues apart in the country's
football pyramid. ==3. SNL Centre==