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 | ||
| 24 January | ||
| 31 January | " Jack Your Body" | Steve 'Silk' Hurley |
| 7 February | " I Knew You Were Waiting (For Me)" | George Michael and Aretha Franklin |
| 14 February | ||
| 21 February | ||
| 28 February | " Stand by Me" | Ben E. King |
| 7 March | ||
| 14 March | ||
| 21 March | " Everything I Own" | Boy George |
| 28 March | ||
| 4 April | " With or Without You" | U2 |
| 11 April | ||
| 18 April | " The Irish Rover" | The Pogues and The Dubliners |
| 25 April | ||
| 2 May | " Nothing's Gonna Stop Us Now" | Starship |
| 9 May | ||
| 16 May | " Hold Me Now" | Johnny Logan |
| 23 May | ||
| 30 May | ||
| 6 June | ||
| 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" | Pet Shop Boys |
| 11 July | ||
| 18 July | " Who's That Girl" | Madonna |
| 25 July | ||
| 1 August | " La Bamba" | Los Lobos |
| 8 August | ||
| 15 August | " I Just Can't Stop Loving You" | Michael Jackson featuring Siedah Garrett |
| 22 August | " What Have I Done to Deserve This?" | 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 | ||
| 19 September | ||
| 26 September | " Bad" | Michael Jackson |
| 3 October | ||
| 10 October | "Full Metal Jacket (I Want to be Your Drill Instructor)" | Abigail Mead and Nigel Goulding |
| 17 October | " You Win Again" | Bee Gees |
| 24 October | ||
| 31 October | ||
| 7 November | ||
| 14 November | " Got My Mind Set on You" | George Harrison |
| 21 November | " China in Your Hand" | T'Pau |
| 28 November | ||
| 5 December | " The Way You Make Me Feel" | Michael Jackson |
| 12 December | " Fairytale of New York" | The Pogues, featuring Kirsty MacColl |
| 19 December | ||
| 26 December |
- 27 Number Ones
- Most weeks at No.1 (song): "Hold Me Now" - Johnny Logan, "You Win Again" - The Bee Gees (4)
- Most weeks at No.1 (artist): U2 (6)
- Most No.1s: U2, Michael Jackson (3)