Dundalk were champions and Cork City finished as runners-up.
Note: Flags indicate national team as has been defined under FIFA eligibility rules.
Each team played each other three times for a total of 33 games.
[4] On 9 October, with three games still remaining, Dundalk retained the title after a 1–1 draw with Shamrock Rovers.
[4] Finn Harps won 2–1 on aggregate and were promoted to 2016 Premier Division.