Number-one albums of 2005 (Ireland)
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These are the Irish Recorded Music Association's number one albums of 2005, per the Top 100 Individual Artist Albums chart.
| Issue Date | Album | Artist |
| January 6 | American Idiot | Green Day |
| January 13 | American Idiot | Green Day |
| January 20 | Hot Fuss | The Killers |
| January 27 | Hot Fuss | The Killers |
| February 3 | Hot Fuss | The Killers |
| February 10 | Hot Fuss | The Killers |
| February 17 | Hot Fuss | The Killers |
| February 24 | Hot Fuss | The Killers |
| March 3 | Hot Fuss | The Killers |
| March 10 | The Massacre | 50 Cent |
| March 17 | Shots | Damien Dempsey |
| March 24 | Language. Sex. Violence. Other? | Stereophonics |
| March 31 | Hot Fuss | The Killers |
| April 7 | Hot Fuss | The Killers |
| April 14 | Hot Fuss | The Killers |
| April 21 | Hot Fuss | The Killers |
| April 28 | Devils & Dust | Bruce Springsteen |
| May 5 | Devils & Dust | Bruce Springsteen |
| May 12 | Devils & Dust | Bruce Springsteen |
| May 19 | Forever Faithless - The Greatest Hits | Faithless |
| May 26 | Forever Faithless - The Greatest Hits | Faithless |
| June 2 | Don't Believe the Truth | Oasis |
| June 9 | X&Y | Coldplay |
| June 16 | X&Y | Coldplay |
| June 23 | X&Y | Coldplay |
| June 30 | Back to Bedlam | James Blunt |
| July 7 | Back to Bedlam | James Blunt |
| July 14 | Back to Bedlam | James Blunt |
| July 21 | Back to Bedlam | James Blunt |
| July 28 | X&Y | Coldplay |
| August 4 | Back to Bedlam | James Blunt |
| August 11 | Back to Bedlam | James Blunt |
| August 18 | Back to Bedlam | James Blunt |
| August 25 | Back to Bedlam | James Blunt |
| September 1 | Back to Bedlam | James Blunt |
| September 8 | Back to Bedlam | James Blunt |
| September 15 | Life in Slow Motion | David Gray |
| September 22 | Life in Slow Motion | David Gray |
| September 29 | Life in Slow Motion | David Gray |
| October 6 | Home | The Corrs |
| October 13 | Back to Bedlam | James Blunt |
| October 20 | Flock | Bell X1 |
| October 27 | Intensive Care | Robbie Williams |
| November 3 | Face to Face | Westlife |
| November 10 | Gift Crub 6 – The Special One | Mario Rosenstock |
| November 17 | Gift Crub 6 – The Special One | Mario Rosenstock |
| November 24 | Gift Crub 6 – The Special One | Mario Rosenstock |
| December 1 | Gift Crub 6 – The Special One | Mario Rosenstock |
| December 8 | Curtain Call: The Hits | Eminem |
| December 15 | Curtain Call: The Hits | Eminem |
| December 22 | Curtain Call: The Hits | Eminem |
| December 29 | Curtain Call: The Hits | Eminem |
