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.^[1]

Issue date	Song	Artist(s)	Reference
4 January	"Sweet but Psycho"	Ava Max	[2]
11 January			[3]
18 January			[4]
25 January	"7 Rings"	Ariana Grande	[5]
1 February			[6]
8 February			[7]
15 February	"Break Up with Your Girlfriend, I'm Bored"		[8]
22 February	"7 Rings"		[9]
1 March	"Someone You Loved"	Lewis Capaldi	[10]
8 March			[11]
15 March			[12]
22 March			[13]
29 March			[14]
5 April			[15]
12 April	"Old Town Road"	Lil Nas X	[16]
19 April			[17]
26 April			[18]
3 May			[19]
10 May	"Hold Me While You Wait"	Lewis Capaldi	[20]
17 May	"I Don't Care"	Ed Sheeran and Justin Bieber	[21]
24 May			[22]
31 May			[23]
7 June			[24]
14 June			[25]
21 June			[26]
28 June	"Señorita"	Shawn Mendes and Camila Cabello	[27]
5 July			[28]
12 July			[29]
19 July			[30]
26 July			[31]
2 August			[32]
9 August			[33]
16 August			[34]
23 August			[35]
30 August	"Dance Monkey"	Tones and I	[36]
6 September			[37]
13 September			[38]
20 September			[39]
27 September			[40]
4 October			[41]
11 October			[42]
18 October			[43]
25 October	"Ride It"	Regard	[44]
1 November	"Lose You to Love Me"	Selena Gomez	[45]
8 November	"Don't Start Now"	Dua Lipa	[46]
15 November			[47]
22 November	"Everything I Wanted"	Billie Eilish	[48]
29 November	"Before You Go"	Lewis Capaldi	[49]
6 December			[50]
13 December			[51]
20 December			[52]
27 December			[53]