The best selling album in 2005 in Ireland was BACK TO BEDLAM by JAMES BLUNT.
| Rank | Artist | Album | Released |
| 1 | JAMES BLUNT | BACK TO BEDLAM | 2004 |
| 2 | NOW SERIES (UK) | NOW THAT'S WHAT I CALL MUSIC! 62 | 2005 |
| 3 | MARIO ROSENSTOCK | GIFT GRUB 6 - THE BEST OF 2005 | 2005 |
| 4 | WESTLIFE | FACE TO FACE | 2005 |
| 5 | COLDPLAY | X&Y | 2005 |
| 6 | KELLY CLARKSON | BREAKAWAY | 2004 |
| 7 | EMINEM | CURTAIN CALL: THE HITS | 2005 |
| 8 | THE KILLERS | HOT FUSS | 2004 |
| 9 | NOW SERIES (UK) | NOW THAT'S WHAT I CALL MUSIC! 61 | 2005 |
| 10 | GREEN DAY | AMERICAN IDIOT | 2004 |
| 11 | IL DIVO | ANCORA | 2005 |
| 12 | ROBBIE WILLIAMS | INTENSIVE CARE | 2005 |
| 13 | GORILLAZ | DEMON DAYS | 2005 |
| 14 | KT TUNSTALL | EYE TO THE TELESCOPE | 2004 |
| 15 | TOMMY FLEMING | VOICE OF HOPE | 2005 |
| 16 | DAVID GRAY | LIFE IN SLOW MOTION | 2005 |
| 17 | FAITHLESS | FOREVER FAITHLESS - THE GREATEST HITS | 2005 |
| 18 | KAISER CHIEFS | EMPLOYMENT | 2005 |
| 19 | KATIE MELUA | PIECE BY PIECE | 2005 |
| 20 | MADONNA | CONFESSIONS ON A DANCE FLOOR | 2005 |
Source: IRMA