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