Shamrock Rovers were the defending champions, having won their nineteenth Premier Division title the previous season.
[3] They retained the title on 24 October as a result of Derry City drawing 0-0 away to Sligo Rovers.
The promoted teams were Shelbourne and UCD, after respective top flight absences of one and three years.
[7][8] Note: Flags indicate national team as has been defined under FIFA eligibility rules.
*Note Sligo Rovers defeated Dundalk 2–0 but the result was overturned by the Football Association of Ireland to a 3–0 win for Dundalk after it was ruled that Sligo had fielded a suspended player.