The best selling album in 2009 in Ireland was I DREAMED A DREAM by SUSAN BOYLE.
| Rank | Artist | Album | Released |
| 1 | SUSAN BOYLE | I DREAMED A DREAM | 2009 |
| 2 | MICHAEL BUBLÉ | CRAZY LOVE | 2009 |
| 3 | LADY GAGA | THE FAME | 2008 |
| 4 | NOW SERIES (UK) | NOW THAT'S WHAT I CALL MUSIC! 74 | 2009 |
| 5 | BEYONCÉ | I AM SASHA FIERCE | 2008 |
| 6 | THE BLACK EYED PEAS | THE E.N.D. | 2009 |
| 7 | U2 | NO LINE ON THE HORIZON | 2009 |
| 8 | WESTLIFE | WHERE WE ARE | 2009 |
| 9 | PAOLO NUTINI | SUNNY SIDE UP | 2009 |
| 10 | THE SCRIPT | THE SCRIPT | 2008 |
| 11 | MICHAEL JACKSON | THE ESSENTIAL MICHAEL JACKSON | 2005 |
| 12 | KINGS OF LEON | ONLY BY THE NIGHT | 2008 |
| 13 | IMELDA MAY | LOVE TATTOO | 2008 |
| 14 | NOW SERIES (UK) | NOW THAT'S WHAT I CALL MUSIC! 73 | 2009 |
| 15 | NOW SERIES (UK) | NOW THAT'S WHAT I CALL MUSIC! 72 | 2009 |
| 16 | JLS | JLS | 2009 |
| 17 | TAKE THAT | THE CIRCUS | 2008 |
| 18 | FLORENCE + THE MACHINE | LUNGS | 2009 |
| 19 | JAMES MORRISON | SONGS FOR YOU, TRUTHS FOR ME | 2008 |
| 20 | LILY ALLEN | IT'S NOT ME, IT'S YOU | 2009 |
Source: IRMA