# List of number-one singles of 2015 (Ireland)

The Irish Singles Chart ranks the best-performing singles in Ireland, as compiled by Chart-Track on behalf of the Irish Recorded Music Association.
| Issue date | Song | Artist(s) |
| 1 January | "Uptown Funk" | Mark Ronson featuring Bruno Mars |
| 8 January | "Uptown Funk" | Mark Ronson featuring Bruno Mars |
| 15 January | "Uptown Funk" | Mark Ronson featuring Bruno Mars |
| 22 January | "Uptown Funk" | Mark Ronson featuring Bruno Mars |
| 29 January | "Uptown Funk" | Mark Ronson featuring Bruno Mars |
| 5 February | "Love Me Like You Do" | Ellie Goulding |
| 12 February | "Love Me Like You Do" | Ellie Goulding |
| 19 February | "Love Me Like You Do" | Ellie Goulding |
| 26 February | "Love Me Like You Do" | Ellie Goulding |
| 5 March | "Love Me Like You Do" | Ellie Goulding |
| 12 March | "Love Me Like You Do" | Ellie Goulding |
| 19 March | "FourFiveSeconds" | Rihanna, Kanye West and Paul McCartney |
| 26 March | "Hold Back the River" | James Bay |
| 2 April | "Cry for Help" | Hometown |
| 9 April | "Cheerleader" | OMI |
| 16 April | "See You Again" | Wiz Khalifa featuring Charlie Puth |
| 23 April | "See You Again" | Wiz Khalifa featuring Charlie Puth |
| 30 April | "See You Again" | Wiz Khalifa featuring Charlie Puth |
| 7 May | "See You Again" | Wiz Khalifa featuring Charlie Puth |
| 14 May | "Cheerleader" | OMI |
| 21 May | "Cheerleader" | OMI |
| 28 May | "Cheerleader" | OMI |
| 4 June | "Cheerleader" | OMI |
| 11 June | "Lean On" | Major Lazer and DJ Snake featuring MØ |
| 18 June | "Lean On" | Major Lazer and DJ Snake featuring MØ |
| 25 June | "Lean On" | Major Lazer and DJ Snake featuring MØ |
| 2 July | "Lean On" | Major Lazer and DJ Snake featuring MØ |
| 9 July | "Are You with Me" | Lost Frequencies |
| 16 July | "Are You with Me" | Lost Frequencies |
| 23 July | "Are You with Me" | Lost Frequencies |
| 30 July | "Are You with Me" | Lost Frequencies |
| 6 August | "Drag Me Down" | One Direction |
| 13 August | "Marvin Gaye" | Charlie Puth featuring Meghan Trainor |
| 20 August | "Can't Feel My Face" | The Weeknd |
| 27 August | "Can't Feel My Face" | The Weeknd |
| 3 September | "What Do You Mean?" | Justin Bieber |
| 10 September | "What Do You Mean?" | Justin Bieber |
| 17 September | "What Do You Mean?" | Justin Bieber |
| 24 September | "What Do You Mean?" | Justin Bieber |
| 1 October | "What Do You Mean?" | Justin Bieber |
| 8 October | "What Do You Mean?" | Justin Bieber |
| 15 October | "What Do You Mean?" | Justin Bieber |
| 22 October | "Perfect" | One Direction |
| 29 October | "Hello" | Adele |
| 5 November | "Hello" | Adele |
| 12 November | "Hello" | Adele |
| 19 November | "Hello" | Adele |
| 26 November | "Sorry" | Justin Bieber |
| 3 December | "Sorry" | Justin Bieber |
| 10 December | "Love Yourself" | Justin Bieber |
| 17 December | "Love Yourself" | Justin Bieber |
| 24 December | "Love Yourself" | Justin Bieber |
| 31 December | "Love Yourself" | Justin Bieber |

## Number-one artists

| Position | Artist | Weeks at No. 1 |
| 1 | Justin Bieber | 13 |
| 2 | Ellie Goulding | 6 |
| 3 | Mark Ronson | 5 |
| 3 | Bruno Mars | 5 |
| 3 | OMI | 5 |
| 3 | Charlie Puth | 5 |
| 7 | Wiz Khalifa | 4 |
| 7 | Major Lazer | 4 |
| 7 | DJ Snake | 4 |
| 7 | MØ | 4 |
| 7 | Lost Frequencies | 4 |
| 7 | Adele | 4 |
| 13 | The Weeknd | 2 |
| 13 | One Direction | 2 |
| 15 | Rihanna | 1 |
| 15 | Kanye West | 1 |
| 15 | Paul McCartney | 1 |
| 15 | Hometown | 1 |
| 15 | James Bay | 1 |
| 15 | Meghan Trainor | 1 |