The best selling album in 2008 in Ireland was ONLY BY THE NIGHT by KINGS OF LEON.
| Rank | Artist | Album | Released |
| 1 | KINGS OF LEON | ONLY BY THE NIGHT | 2008 |
| 2 | NOW SERIES (UK) | NOW THAT'S WHAT I CALL MUSIC! 71 | 2008 |
| 3 | THE SCRIPT | THE SCRIPT | 2008 |
| 4 | LEONA LEWIS | SPIRIT | 2007 |
| 5 | TAKE THAT | THE CIRCUS | 2008 |
| 6 | THE PRIESTS | THE PRIESTS | 2008 |
| 7 | COLDPLAY | VIVA LA VIDA OR DEATH AND ALL HIS FRIENDS | 2008 |
| 8 | RIHANNA | GOOD GIRL GONE BAD | 2007 |
| 9 | NOW SERIES (UK) | NOW THAT'S WHAT I CALL MUSIC! 70 | 2008 |
| 10 | NOW SERIES (UK) | NOW THAT'S WHAT I CALL MUSIC! 69 | 2008 |
| 11 | SOUNDTRACK | MAMMA MIA! THE MOVIE SOUNDTRACK | 2008 |
| 12 | DUFFY | ROCKFERRY | 2008 |
| 13 | AMY WINEHOUSE | BACK TO BLACK | 2006 |
| 14 | SHARON SHANNON | GALWAY GIRL...THE BEST OF | 2008 |
| 15 | MARY BLACK | 25 YEARS - 25 SONGS | 2008 |
| 16 | THE KILLERS | DAY & AGE | 2008 |
| 17 | CELINE DION | MY LOVE: ESSENTIAL COLLECTION | 2008 |
| 18 | SNOW PATROL | A HUNDRED MILLION SUNS | 2008 |
| 19 | GLEN HANSARD & MARKETA IRGLOVA | ONCE (OST) | 2008 |
| 20 | AC/DC | BLACK ICE | 2008 |
Source: IRMA