Number-one singles in Ireland (2005)
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This is a list of the Irish Recorded Music Association's Irish Singles Chart Top 50 number-ones of 2005.
| Issue Date | Song | Artist |
| January 6 | Numb/Encore | Linkin Park and Jay-Z |
| January 13 | Numb/Encore | Linkin Park and Jay-Z |
| January 20 | Numb/Encore | Linkin Park and Jay-Z |
| January 27 | Numb/Encore | Linkin Park and Jay-Z |
| February 3 | Poison/I Believe | Zoo |
| February 10 | Almost Here | Brian McFadden and Delta Goodrem |
| February 17 | Get Right | Jennifer Lopez |
| February 24 | Over and Over | Nelly and Tim McGraw |
| March 3 | Over and Over | Nelly and Tim McGraw |
| March 10 | Over and Over | Nelly and Tim McGraw |
| March 17 | All about You/You've Got a Friend | McFly |
| March 24 | All about You/You've Got a Friend | McFly |
| March 31 | (Is This the Way to) Amarillo | Tony Christie featuring Peter Kay |
| April 7 | (Is This the Way to) Amarillo | Tony Christie featuring Peter Kay |
| April 14 | (Is This the Way to) Amarillo | Tony Christie featuring Peter Kay |
| April 21 | (Is This the Way to) Amarillo | Tony Christie featuring Peter Kay |
| April 28 | (Is This the Way to) Amarillo | Tony Christie featuring Peter Kay |
| May 5 | Lonely | Akon |
| May 12 | Lonely | Akon |
| May 19 | Lonely | Akon |
| May 26 | Lonely | Akon |
| June 2 | Axel F | Crazy Frog |
| June 9 | Axel F | Crazy Frog |
| June 16 | Axel F | Crazy Frog |
| June 23 | Axel F | Crazy Frog |
| June 30 | Ghetto Gospel | 2Pac |
| July 7 | Ghetto Gospel | 2Pac |
| July 9 | Ghetto Gospel | 2Pac |
| July 14 | Ghetto Gospel | 2Pac |
| July 21 | You're Beautiful | James Blunt |
| July 28 | You're Beautiful | James Blunt |
| August 4 | You're Beautiful | James Blunt |
| August 11 | You're Beautiful | James Blunt |
| August 18 | Bad Day | Daniel Powter |
| August 25 | Bad Day | Daniel Powter |
| September 1 | Bad Day | Daniel Powter |
| September 8 | Bad Day | Daniel Powter |
| September 15 | Don't Cha | The Pussycat Dolls |
| September 22 | Don't Cha | The Pussycat Dolls |
| September 29 | Don't Cha | The Pussycat Dolls |
| October 6 | Push the Button | Sugababes |
| October 13 | Push the Button | Sugababes |
| October 20 | Push the Button | Sugababes |
| October 27 | You Raise Me Up | Westlife |
| November 3 | You Raise Me Up | Westlife |
| November 10 | You Raise Me Up | Westlife |
| November 17 | You Raise Me Up | Westlife |
| November 24 | You Raise Me Up | Westlife |
| December 1 | You Raise Me Up | Westlife |
| December 8 | My Humps | The Black Eyed Peas |
| December 15 | JCB Song | Nizlopi |
| December 22 | Leave Right Now | Mario Rosenstock |
| December 29 | JCB Song | Nizlopi |
