The Premier Division consists of ten teams.
The league began on 4 March[3] and ended on 29 October.
Defending champions Shamrock Rovers retained the league title with victory over UCD on 25 October 2011.
[4][5] Source:[7] Galway United, the tenth-placed team in the 2011 Premier Division, and Monaghan United, the third-placed team from the 2011 First Division, played off to see who would play in the 2012 Premier Division.
[11] Monaghan United won 5–1 on aggregate and were promoted to the Premier Division.