# List of number-one singles of 2011 (Ireland)

The Irish Singles Chart is a record chart compiled by Chart-Track on behalf of the Irish Recorded Music Association. The chart week runs from Friday to Thursday.
| Issue date | Song | Artist |
| 6 January | "When We Collide" | Matt Cardle |
| 13 January | "Grenade" | Bruno Mars |
| 20 January | "Grenade" | Bruno Mars |
| 27 January | "Grenade" | Bruno Mars |
| 3 February | "Grenade" | Bruno Mars |
| 10 February | "Price Tag" | Jessie J featuring B.o.B |
| 17 February | "Born This Way" | Lady Gaga |
| 24 February | "Price Tag" | Jessie J featuring B.o.B |
| 3 March | "Someone Like You" | Adele |
| 10 March | "Someone Like You" | Adele |
| 17 March | "Someone Like You" | Adele |
| 24 March | "Someone Like You" | Adele |
| 31 March | "Someone Like You" | Adele |
| 7 April | "Someone Like You" | Adele |
| 14 April | "On the Floor" | Jennifer Lopez featuring Pitbull |
| 21 April | "Party Rock Anthem" | LMFAO featuring Lauren Bennett and GoonRock |
| 28 April | "Party Rock Anthem" | LMFAO featuring Lauren Bennett and GoonRock |
| 5 May | "Party Rock Anthem" | LMFAO featuring Lauren Bennett and GoonRock |
| 12 May | "Party Rock Anthem" | LMFAO featuring Lauren Bennett and GoonRock |
| 19 May | "Lipstick" | Jedward |
| 26 May | "Lipstick" | Jedward |
| 2 June | "Give Me Everything" | Pitbull featuring Ne-Yo, Afrojack and Nayer |
| 9 June | "Give Me Everything" | Pitbull featuring Ne-Yo, Afrojack and Nayer |
| 16 June | "Give Me Everything" | Pitbull featuring Ne-Yo, Afrojack and Nayer |
| 23 June | "Give Me Everything" | Pitbull featuring Ne-Yo, Afrojack and Nayer |
| 30 June | "Give Me Everything" | Pitbull featuring Ne-Yo, Afrojack and Nayer |
| 7 July | "Bad Behaviour" | Jedward |
| 14 July | "Glad You Came" | The Wanted |
| 21 July | "Glad You Came" | The Wanted |
| 28 July | "Glad You Came" | The Wanted |
| 4 August | "Glad You Came" | The Wanted |
| 11 August | "Glad You Came" | The Wanted |
| 18 August | "Moves Like Jagger" | Maroon 5 featuring Christina Aguilera |
| 25 August | "Moves Like Jagger" | Maroon 5 featuring Christina Aguilera |
| 1 September | "Moves Like Jagger" | Maroon 5 featuring Christina Aguilera |
| 8 September | "Moves Like Jagger" | Maroon 5 featuring Christina Aguilera |
| 15 September | "What Makes You Beautiful" | One Direction |
| 22 September | "What Makes You Beautiful" | One Direction |
| 29 September | "What Makes You Beautiful" | One Direction |
| 6 October | "What Makes You Beautiful" | One Direction |
| 13 October | "We Found Love" | Rihanna featuring Calvin Harris |
| 20 October | "We Found Love" | Rihanna featuring Calvin Harris |
| 27 October | "We Found Love" | Rihanna featuring Calvin Harris |
| 3 November | "We Found Love" | Rihanna featuring Calvin Harris |
| 10 November | "We Found Love" | Rihanna featuring Calvin Harris |
| 17 November | "We Found Love" | Rihanna featuring Calvin Harris |
| 24 November | "We Found Love" | Rihanna featuring Calvin Harris |
| 1 December | "Wishing on a Star" | The X Factor 2011 Finalists featuring One Direction and JLS |
| 8 December | "Wishing on a Star" | The X Factor 2011 Finalists featuring One Direction and JLS |
| 15 December | "Cannonball" | Little Mix |
| 22 December | "Cannonball" | Little Mix |
| 29 December | "Cannonball" | Little Mix |