# List of number-one singles of 1990 (Ireland)

The following is a list of the IRMA's number-one singles of 1990.
Three consecutive number ones ("Give It A Lash Jack", "The Game", and "Put 'Em Under Pressure") related to the Republic of Ireland team's competing in the 1990 FIFA World Cup.
"Put 'Em Under Pressure", the official song of the 1990 World Cup campaign, was at the No. 1 spot for 13 weeks.
| Issue Date | Song | Artist |
| 4 January | "Do They Know It's Christmas?" | Band Aid II |
| 11 January | "Do They Know It's Christmas?" | Band Aid II |
| 18 January | "Hangin' Tough" | New Kids On The Block |
| 25 January | "Nothing Compares 2 U" | Sinéad O'Connor |
| 1 February | "Nothing Compares 2 U" | Sinéad O'Connor |
| 8 February | "Nothing Compares 2 U" | Sinéad O'Connor |
| 15 February | "Nothing Compares 2 U" | Sinéad O'Connor |
| 22 February | "Nothing Compares 2 U" | Sinéad O'Connor |
| 1 March | "Nothing Compares 2 U" | Sinéad O'Connor |
| 8 March | "Love Shack" | The B-52's |
| 15 March | "Brits Mix 1990" | Various Artists |
| 22 March | "That Sounds Good To Me" | Jive Bunny & The Mastermixers |
| 29 March | "That Sounds Good To Me" | Jive Bunny & The Mastermixers |
| 5 April | "The By-road to Glenroe" | Mick Lally |
| 12 April | "The By-road to Glenroe" | Mick Lally |
| 19 April | "The By-road to Glenroe" | Mick Lally |
| 26 April | "The By-road to Glenroe" | Mick Lally |
| 3 May | "The By-road to Glenroe" | Mick Lally |
| 10 May | "Give It A Lash Jack" | Liam Harrison and the GOAL Celebrities |
| 17 May | "The Game" | The Memories |
| 24 May | "Give It A Lash Jack" | Liam Harrison and the GOAL Celebrities |
| 31 May | "Put 'Em Under Pressure" | The Republic of Ireland Football Squad |
| 7 June | "Put 'Em Under Pressure" | The Republic of Ireland Football Squad |
| 14 June | "Put 'Em Under Pressure" | The Republic of Ireland Football Squad |
| 21 June | "Put 'Em Under Pressure" | The Republic of Ireland Football Squad |
| 28 June | "Put 'Em Under Pressure" | The Republic of Ireland Football Squad |
| 5 July | "Put 'Em Under Pressure" | The Republic of Ireland Football Squad |
| 12 July | "Put 'Em Under Pressure" | The Republic of Ireland Football Squad |
| 19 July | "Put 'Em Under Pressure" | The Republic of Ireland Football Squad |
| 26 July | "Put 'Em Under Pressure" | The Republic of Ireland Football Squad |
| 2 August | "Put 'Em Under Pressure" | The Republic of Ireland Football Squad |
| 9 August | "Put 'Em Under Pressure" | The Republic of Ireland Football Squad |
| 16 August | "Put 'Em Under Pressure" | The Republic of Ireland Football Squad |
| 23 August | "Put 'Em Under Pressure" | The Republic of Ireland Football Squad |
| 30 August | "Itsy Bitsy Teeny Weeny Yellow Polka Dot Bikini" | Bombalurina |
| 6 September | "The Joker" | The Steve Miller Band |
| 13 September | "The Joker" | The Steve Miller Band |
| 20 September | "I Useta Lover" | The Saw Doctors |
| 27 September | "I Useta Lover" | The Saw Doctors |
| 4 October | "I Useta Lover" | The Saw Doctors |
| 11 October | "I Useta Lover" | The Saw Doctors |
| 18 October | "I Useta Lover" | The Saw Doctors |
| 25 October | "I Useta Lover" | The Saw Doctors |
| 1 November | "I Useta Lover" | The Saw Doctors |
| 8 November | "Unchained Melody" | The Righteous Brothers |
| 15 November | "Unchained Melody" | The Righteous Brothers |
| 22 November | "Ooh Aah Paul McGrath" | Watch Your House |
| 29 November | "Ooh Aah Paul McGrath" | Watch Your House |
| 6 December | "Ice Ice Baby" | Vanilla Ice |
| 13 December | "The Christmas No 1" | Zig and Zag |
| 20 December | "The Christmas No 1" | Zig and Zag |
| 27 December | "The Christmas No 1" | Zig and Zag |
* 18 number ones
* Most number ones: All artists one number one
* Most weeks at number one (single): "Put 'Em Under Pressure" - The Republic of Ireland Football Squad (13 weeks)
* Most weeks at number one (artist): The Republic of Ireland Football Squad (13 weeks)