This is a list of singles which have reached number one on the Irish Singles Chart in 1986.
| Week ending | Song | Artist |
|---|---|---|
| 4 January | "Thank You Very Much Mr Eastwood" | Dermot Morgan |
| 11 January | ||
| 18 January | " The Sun Always Shines on T.V." | a-ha |
| 25 January | " Walk of Life" | Dire Straits |
| 1 February | " Borderline" | Madonna |
| 8 February | " Only Love" | Nana Mouskouri |
| 15 February | " When the Going Gets Tough, the Tough Get Going" | Billy Ocean |
| 22 February | ||
| 1 March | " Chain Reaction" | Diana Ross |
| 8 March | ||
| 15 March | " Absolute Beginners" | David Bowie |
| 22 March | ||
| 29 March | " Living Doll" | Cliff Richard and The Young Ones |
| 5 April | ||
| 12 April | ||
| 19 April | ||
| 26 April | " Rock Me Amadeus" | Falco |
| 3 May | " Look Away" | Big Country |
| 10 May | "Make It Work" | Christy Moore, Paul Doran and the Self Aid Band |
| 17 May | " The Chicken Song" | Spitting Image |
| 24 May | ||
| 31 May | " Rollin' Home" | Status Quo |
| 7 June | " Holding Back the Years" | Simply Red |
| 14 June | " Spirit in the Sky" | Doctor and the Medics |
| 21 June | " The Edge of Heaven" | Wham! |
| 28 June | " Papa Don't Preach" | Madonna |
| 5 July | ||
| 12 July | " The Lady in Red" | Chris de Burgh |
| 19 July | ||
| 26 July | ||
| 2 August | ||
| 9 August | ||
| 16 August | ||
| 23 August | ||
| 30 August | " I Want to Wake Up with You" | Boris Gardiner |
| 6 September | ||
| 13 September | " Don't Leave Me This Way" | The Communards |
| 20 September | ||
| 27 September | ||
| 4 October | " True Blue" | Madonna |
| 11 October | ||
| 18 October | " In the Army Now" | Status Quo |
| 25 October | " All I Ask of You" | Cliff Richard and Sarah Brightman |
| 1 November | " Take My Breath Away" | Berlin |
| 8 November | ||
| 15 November | ||
| 22 November | ||
| 29 November | " The Final Countdown" | Europe |
| 6 December | ||
| 13 December | " Caravan of Love" | The Housemartins |
| 20 December | ||
| 27 December |
- 27 Number Ones
- Most weeks at No.1 (song): "The Lady in Red" - Chris de Burgh (7)
- Most weeks at No.1 (artist): Chris de Burgh (7)
- Most No.1s: Madonna (3)