List of number-one singles of 2018 (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
5 January	"Perfect"	Ed Sheeran	[2]
12 January			[3]
19 January			[4]
26 January	"IDGAF"	Dua Lipa	[5]
2 February	"God's Plan"	Drake	[6]
9 February			[7]
16 February			[8]
23 February			[9]
2 March			[10]
9 March			[11]
16 March			[12]
23 March			[13]
30 March			[14]
6 April			[15]
13 April	"One Kiss"	Calvin Harris and Dua Lipa	[16]
20 April			[17]
27 April	"No Tears Left to Cry"	Ariana Grande	[18]
4 May	"One Kiss"	Calvin Harris and Dua Lipa	[19]
11 May			[20]
18 May			[21]
25 May			[22]
1 June			[23]
8 June			[24]
15 June			[25]
22 June	"Solo"	Clean Bandit featuring Demi Lovato	[26]
29 June	"Shotgun"	George Ezra	[27]
6 July			[28]
13 July			[29]
20 July			[30]
27 July			[31]
3 August			[32]
10 August			[33]
17 August			[34]
24 August			[35]
31 August	"Eastside"	Benny Blanco, Halsey and Khalid	[36]
7 September	"Promises"	Calvin Harris and Sam Smith	[37]
14 September			[38]
21 September			[39]
28 September			[40]
5 October			[41]
12 October	"Shallow"	Lady Gaga and Bradley Cooper	[42]
19 October			[43]
26 October			[44]
2 November			[45]
9 November	"Thank U, Next"	Ariana Grande	[46]
16 November			[47]
23 November			[48]
30 November			[49]
7 December			[50]
14 December			[51]
21 December	"Sweet but Psycho"	Ava Max	[52]
28 December			[53]