This is a list of singles which have reached number one on the Irish Singles Chart in 1987.
| Week ending | Song | Artist |
|---|---|---|
| 3 January | Caravan of Love | The Housemartins |
| 10 January | Reet Petite | Jackie Wilson |
| 17 January | Reet Petite | Jackie Wilson |
| 24 January | Reet Petite | Jackie Wilson |
| 31 January | Jack Your Body | Steve 'Silk' Hurley |
| 7 February | I Knew You Were Waiting (For Me) | George Michael and Aretha Franklin |
| 14 February | I Knew You Were Waiting (For Me) | George Michael and Aretha Franklin |
| 21 February | I Knew You Were Waiting (For Me) | George Michael and Aretha Franklin |
| 28 February | Stand By Me | Ben E. King |
| 7 March | Stand By Me | Ben E. King |
| 14 March | Stand By Me | Ben E. King |
| 21 March | Everything I Own | Boy George |
| 28 March | Everything I Own | Boy George |
| 4 April | With or Without You | U2 |
| 11 April | With or Without You | U2 |
| 18 April | The Irish Rover | The Pogues and The Dubliners |
| 25 April | The Irish Rover | The Pogues and The Dubliners |
| 2 May | Nothing's Gonna Stop Us Now | Starship |
| 9 May | Nothing's Gonna Stop Us Now | Starship |
| 16 May | Hold Me Now | Johnny Logan |
| 23 May | Hold Me Now | Johnny Logan |
| 30 May | Hold Me Now | Johnny Logan |
| 6 June | Hold Me Now | Johnny Logan |
| 13 June | I Still Haven't Found What I'm Looking For | U2 |
| 20 June | I Want Your Sex | George Michael |
| 27 June | Star Trekkin' | The Firm |
| 4 July | It's a Sin | The Pet Shop Boys |
| 11 July | It's a Sin | The Pet Shop Boys |
| 18 July | Who's That Girl | Madonna |
| 25 July | Who's That Girl | Madonna |
| 1 August | La Bamba | Los Lobos |
| 8 August | La Bamba | Los Lobos |
| 15 August | I Just Can't Stop Loving You | Michael Jackson featuring Siedah Garrett |
| 22 August | What Have I Done to Deserve This? | The Pet Shop Boys featuring Dusty Springfield |
| 29 August | Four Track EP | Daniel O'Donnell |
| 5 September | Where the Streets Have No Name | U2 |
| 12 September | Where the Streets Have No Name | U2 |
| 19 September | Where the Streets Have No Name | U2 |
| 26 September | Bad | Michael Jackson |
| 3 October | Bad | Michael Jackson |
| 10 October | Full Metal Jacket (I Want to be Your Drill Instructor) | Abigail Mead and Nigel Goulding |
| 17 October | You Win Again | The Bee Gees |
| 24 October | You Win Again | The Bee Gees |
| 31 October | You Win Again | The Bee Gees |
| 7 November | You Win Again | The Bee Gees |
| 14 November | Got My Mind Set on You | George Harrison |
| 21 November | China in Your Hand | T'Pau |
| 28 November | China in Your Hand | T'Pau |
| 5 December | The Way You Make Me Feel | Michael Jackson |
| 12 December | Fairytale of New York | The Pogues featuring Kirsty MacColl |
| 19 December | Fairytale of New York | The Pogues featuring Kirsty MacColl |
| 26 December | Fairytale of New York | The Pogues featuring Kirsty MacColl |
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