| Competition: | League of Ireland Premier Division |
| Season: | 2015 |
| Winners: | Dundalk (11th title) |
| Relegated: | Limerick Drogheda United |
| Continentalcup1: | Champions League |
| Continentalcup1 Qualifiers: | Dundalk |
| Continentalcup2: | Europa League |
| Continentalcup2 Qualifiers: | Cork City St. Patrick's Athletic Shamrock Rovers |
| Matches: | 198 |
| Total Goals: | 548 |
| League Topscorer: | Richie Towell |
| Biggest Home Win: | Dundalk 8-1 Bray Wanderers (4 May 2015) |
| Biggest Away Win: | Bray Wanderers 0-5 Galway United (25 April 2015) |
| Highest Scoring: | Dundalk 8-1 Bray Wanderers (4 May 2015) |
| Attendance: | 324,332[2] [3] |
| Average Attendance: | 1,638 |
| Highest Attendance: | 6,900[4] |
| Prevseason: | 2014 |
| Nextseason: | 2016 |
The 2015 League of Ireland Premier Division was the 31st season of the League of Ireland Premier Division. Dundalk were champions and Cork City finished as runners-up.
Note: Flags indicate national team as has been defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.
| Team | Manager | Captain | Kit manufacturer | Shirt sponsor | |
|---|---|---|---|---|---|
| Bohemians |  Keith Long | Derek Pender | Hummel | Mr Green | |
| Bray Wanderers | Alan Mathews Maciej Tarnogrodzki David Cassidy Trevor Croly David Cassidy Mick Cooke | David Cassidy | Nike | Royal Hotel | |
| Cork City | John Caulfield | John Dunleavy | Nike | Clonakilty Sausages | |
| Derry City | Paul Hegarty | Ryan McBride | Umbro | Diamond Corrugated | |
| Drogheda United | John McDonnell Mark Kinsella | Michael Daly | Nike | Scotch Hall Shopping Center | |
| Dundalk | Stephen Kenny | Stephen O'Donnell | Umbro | Fyffes | |
| Galway United | Tommy Dunne | Paul Sinnott | Macron | Comer Property Management | |
| Limerick | Martin Russell | Shane Duggan | Macron | Galtee Fuels | |
| Longford Town | Tony Cousins | Mark Salmon | Macron | City Calling | |
| Shamrock Rovers | Pat Fenlon | Conor Kenna | Warrior | Pepper | |
| Sligo Rovers | Owen Heary Joseph N'Do & Gavin DykesMicky Adams | Gavin Peers | Umbro | Volkswagen | |
| St Patrick's Athletic | Liam Buckley | Ger O'Brien | Umbro | Clune Construction Company L.P. |
The 2015 Premier Division consisted of 12 teams. Each team played each other three times for a total of 33 games. The season began on 6 March and concluded on 30 October.[5] On 9 October, with three games still remaining, Dundalk retained the title after a 1–1 draw with Shamrock Rovers.[6] [7] [8]
| Rank | Player | Club | Goals |
|---|---|---|---|
| 1 | Richie Towell | Dundalk | 25 |
| 2 | Karl Sheppard | Cork City | 13 |
| 3 | Vinny Faherty | Limerick | 12 |
 Jake Keegan | Galway United | ||
| Enda Curran | Galway United | ||
| Michael Drennan | Shamrock Rovers | ||
| David McMillan | Dundalk | ||
| Daniel Corcoran | Sligo Rovers | ||
| 9 | Christopher Forrester | St Patrick's Athletic | 11 |
| Brandon Miele | Shamrock Rovers | ||
Limerick, the eleventh placed team from the Premier Division played off against Finn Harps, the winner of the 2015 First Division play off, to decide who would play in the 2016 Premier Division.[5]
Finn Harps won 2–1 on aggregate and were promoted to 2016 Premier Division. Limerick are relegated to the 2016 First Division.