# List of number-one singles of 2019 (Ireland)

The Irish Singles Chart ranks the best-performing singles in Ireland, as compiled by the Official Charts Company on behalf of the Irish Recorded Music Association.
| Issue date | Song | Artist(s) |
| 4 January | "Sweet but Psycho" | Ava Max |
| 11 January | "Sweet but Psycho" | Ava Max |
| 18 January | "Sweet but Psycho" | Ava Max |
| 25 January | "7 Rings" | Ariana Grande |
| 1 February | "7 Rings" | Ariana Grande |
| 8 February | "7 Rings" | Ariana Grande |
| 15 February | "Break Up with Your Girlfriend, I'm Bored" | Ariana Grande |
| 22 February | "7 Rings" | Ariana Grande |
| 1 March | "Someone You Loved" | Lewis Capaldi |
| 8 March | "Someone You Loved" | Lewis Capaldi |
| 15 March | "Someone You Loved" | Lewis Capaldi |
| 22 March | "Someone You Loved" | Lewis Capaldi |
| 29 March | "Someone You Loved" | Lewis Capaldi |
| 5 April | "Someone You Loved" | Lewis Capaldi |
| 12 April | "Old Town Road" | Lil Nas X |
| 19 April | "Old Town Road" | Lil Nas X |
| 26 April | "Old Town Road" | Lil Nas X |
| 3 May | "Old Town Road" | Lil Nas X |
| 10 May | "Hold Me While You Wait" | Lewis Capaldi |
| 17 May | "I Don't Care" | Ed Sheeran and Justin Bieber |
| 24 May | "I Don't Care" | Ed Sheeran and Justin Bieber |
| 31 May | "I Don't Care" | Ed Sheeran and Justin Bieber |
| 7 June | "I Don't Care" | Ed Sheeran and Justin Bieber |
| 14 June | "I Don't Care" | Ed Sheeran and Justin Bieber |
| 21 June | "I Don't Care" | Ed Sheeran and Justin Bieber |
| 28 June | "Señorita" | Shawn Mendes and Camila Cabello |
| 5 July | "Señorita" | Shawn Mendes and Camila Cabello |
| 12 July | "Señorita" | Shawn Mendes and Camila Cabello |
| 19 July | "Señorita" | Shawn Mendes and Camila Cabello |
| 26 July | "Señorita" | Shawn Mendes and Camila Cabello |
| 2 August | "Señorita" | Shawn Mendes and Camila Cabello |
| 9 August | "Señorita" | Shawn Mendes and Camila Cabello |
| 16 August | "Señorita" | Shawn Mendes and Camila Cabello |
| 23 August | "Señorita" | Shawn Mendes and Camila Cabello |
| 30 August | "Dance Monkey" | Tones and I |
| 6 September | "Dance Monkey" | Tones and I |
| 13 September | "Dance Monkey" | Tones and I |
| 20 September | "Dance Monkey" | Tones and I |
| 27 September | "Dance Monkey" | Tones and I |
| 4 October | "Dance Monkey" | Tones and I |
| 11 October | "Dance Monkey" | Tones and I |
| 18 October | "Dance Monkey" | Tones and I |
| 25 October | "Ride It" | Regard |
| 1 November | "Lose You to Love Me" | Selena Gomez |
| 8 November | "Don't Start Now" | Dua Lipa |
| 15 November | "Don't Start Now" | Dua Lipa |
| 22 November | "Everything I Wanted" | Billie Eilish |
| 29 November | "Before You Go" | Lewis Capaldi |
| 6 December | "Before You Go" | Lewis Capaldi |
| 13 December | "Before You Go" | Lewis Capaldi |
| 20 December | "Before You Go" | Lewis Capaldi |
| 27 December | "Before You Go" | Lewis Capaldi |

## Number-one artists

| Position | Artist | Weeks at No. 1 |
| 1 | Lewis Capaldi | 12 |
| 2 | Shawn Mendes | 9 |
| 2 | Camila Cabello | 9 |
| 4 | Tones and I | 8 |
| 5 | Ed Sheeran | 6 |
| 5 | Justin Bieber | 6 |
| 7 | Ariana Grande | 5 |
| 8 | Lil Nas X | 4 |
| 9 | Ava Max | 3 |
| 10 | Dua Lipa | 2 |
| 11 | Regard | 1 |
| 11 | Selena Gomez | 1 |
| 11 | Billie Eilish | 1 |