|UEFA Champions League||Shamrock Rovers|
|UEFA Europa League||Sligo Rovers|
St. Patrick's Athletic
|Setanta Cup||Shamrock Rovers|
St. Patrick's Athletic
|Goals scored||503 (2.79 per match)|
|Top goalscorer||Éamon Zayed: 22 |
(Derry City) 
|Biggest home win||Derry City 7–0 UCD|
|Biggest away win||Galway United 0–8 Sligo Rovers|
|Highest scoring||UCD 5–4 Drogheda United|
|Longest winning run||Shamrock Rovers, Sligo Rovers (5 games each)|
|Longest unbeaten run||Derry City|
|Longest winless run||Galway United|
|Longest losing run||Galway United|
The 2011 League of Ireland Premier Division was the 27th season of the League of Ireland Premier Division. The league was also known as the Airtricity League for sponsorship reasons. The division featured 10 teams. Shamrock Rovers were champions while Sligo Rovers finished as runners-up.
The Premier Division consists of ten teams. Each team played every other team four times, twice at home and twice away, for a total of 36 matches. The league began on 4 March  and ended on 29 October. Defending champions Shamrock Rovers retained the league title with victory over UCD on 25 October 2011.
|Pos||Team||Pld||W||D||L||GF||GA||GD||Pts||Qualification or relegation|
|1||Shamrock Rovers (C)||36||23||8||5||69||24||+45||77||Qualification to Champions League second qualifying round|
|2||Sligo Rovers||36||22||7||7||73||19||+54||73||Qualification to Europa League second qualifying round[a]|
|3||Derry City||36||18||14||4||63||23||+40||68||Banned from 2012–13 European competitions[b]|
|4||St Patrick's Athletic||36||17||12||7||62||35||+27||63||Qualification to Europa League first qualifying round|
|10||Galway United[c]||36||1||3||32||20||115||−95||6||Qualification to Relegation play-off|
Rules for classification: 1) points; 2) goal difference; 3) number of goals scored.
|1||Éamon Zayed||Derry City ||22|
|2||Eoin Doyle||Sligo Rovers||20|
|3||Danny North||St. Patrick's Athletic||15|
|Gary Twigg||Shamrock Rovers||15|
|Éamon Zayed||Derry City |
|Enda Stevens||Shamrock Rovers |
PFAI Team of the Year
|No.||Pos.||Player||Date of birth (age)||Caps||Club|
|1||GK||Gerard Doherty||Derry City|
|2||DF||Patrick Sullivan||Shamrock Rovers|
|3||DF||Stewart Greacen||Derry City|
|4||DF||Craig Sives||Shamrock Rovers|
|5||DF||Enda Stevens||Shamrock Rovers|
|6||MF||Stephen Bradley||St Patrick's Athletic|
|7||MF||Daryl Kavanagh||St Patrick's Athletic|
|8||MF||Richie Ryan||Sligo Rovers|
|10||FW||Éamon Zayed||Derry City|
|11||FW||Eoin Doyle||Sligo Rovers|
|April||Gary Dempsey||Bray Wanderers|
|May||Eoin Doyle||Sligo Rovers|
|June||Danny North||St. Patrick's Athletic|
|July||Conor McCormack||Shamrock Rovers|
|August||Patrick Sullivan||Shamrock Rovers|
|September||Joseph Ndo||Sligo Rovers|
|October||Karl Sheppard||Shamrock Rovers|
|November||Stephen Paisley [note 1]||Shelbourne|
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. The playoff was contested in a two-legged format.
|1 November 2011||Monaghan United||2 – 0||Galway United||Kingspan Century Park|
|19.45 GMT||Isichei 13'
S. Brennan 87'
|4 November 2011||Galway United||1 – 3||Monaghan United||Terryland Park|
|19.45 GMT||Murphy 82'|| 26', 33' O'Brien
51' R. Brennan
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- "Derry City are refused entry to Europa League by Uefa". www.bbc.co.uk. 21 February 2012.
- "Zayed scoops Player of the Year award". extratime.ie. 13 November 2011. Archived from the original on 17 August 2016. Retrieved 4 August 2016.