| Competition: | League of Ireland Premier Division |
| Season: | 2009 |
| Winners: | Bohemians (11th title) |
| Relegated: | Cork City Derry City |
| Continentalcup1: | UEFA Champions League |
| Continentalcup1 Qualifiers: | Bohemians |
| Continentalcup2: | UEFA Europa League |
| Continentalcup2 Qualifiers: | Shamrock Rovers Dundalk Sporting Fingal[1] |
| League Topscorer: | Gary Twigg 24 |
| Prevseason: | 2008 |
| Nextseason: | 2010 |
The 2009 League of Ireland Premier Division was the 25th season of the League of Ireland Premier Division. The division was made up of 10 teams. Bohemians were champions while Shamrock Rovers finished as runners-up.
| Team | Base | Manager | Stadium |
|---|---|---|---|
| Drogheda | |||
| Dundalk | |||
 Pete Mahon | |||
The 2009 Premier Division featured 10 clubs. The regular season began on 6 March and concluded on 6 November. Each team played every other team four times, totalling 36 matches.[3] On the final day of the regular season Bohemians were crowned League of Ireland champions for the eleventh time in the club's history after drawing 1–1 with Bray Wanderers at the Carlisle Grounds.[4] After the season ended both Derry City and Cork City were expelled from the League of Ireland. Derry City were accused of making extra payments to players using unofficial secondary contracts. This was against league rules which placed limits on the amount clubs could spend on players' wages. Cork City had been in serious financial difficulties for several seasons and its holding company was eventually wound up by the High Court. However both clubs were effectively reformed and were subsequently allowed to join the 2010 First Division.[3] [5] [6] [7] [8]
The ninth and tenth placed teams from the Premier Division, Drogheda United and Bray Wanderers, played off after the regular season was completed. The winner would retain a place in the 2010 Premier Division. The loser would play off against the winner of the 2009 First Division play off. The winner of this match would also gain a place in the 2010 Premier Division.
| Rank | Scorer | Team | Goals |
|---|---|---|---|
| 1 | Gary Twigg | Shamrock Rovers | 24 |
| 2 | Jason Byrne | Bohemians | 22 |
| 3 | Raffaele Cretaro | Sligo Rovers | 15 |
| 4 | Chris Turner | Dundalk | 12 |
| 5 | Mark Farren | Derry City | 10 |
Last updated: 6 November 2009
Source: soccerway.com