# List of number-one singles of 1989 (Ireland)

The following is a list of the IRMA's number-one singles of 1989.
| Issue Date | Song | Artist |
| 5 January | "Especially for You" | Kylie Minogue and Jason Donovan |
| 12 January | "Especially for You" | Kylie Minogue and Jason Donovan |
| 19 January | "Especially for You" | Kylie Minogue and Jason Donovan |
| 26 January | "The Living Years" | Mike + The Mechanics |
| 2 February | "Something's Gotten Hold of My Heart" | Marc Almond featuring Gene Pitney |
| 9 February | "Something's Gotten Hold of My Heart" | Marc Almond featuring Gene Pitney |
| 16 February | "Belfast Child" | Simple Minds |
| 23 February | "Belfast Child" | Simple Minds |
| 2 March | "Leave Me Alone" | Michael Jackson |
| 9 March | "Too Many Broken Hearts" | Jason Donovan |
| 16 March | "Like a Prayer" | Madonna |
| 23 March | "Like a Prayer" | Madonna |
| 30 March | "Paradise City" | Guns N' Roses |
| 6 April | "Eternal Flame" | The Bangles |
| 13 April | "When Love Comes to Town" | U2 featuring B. B. King |
| 20 April | "Eternal Flame" | The Bangles |
| 27 April | "Eternal Flame" | The Bangles |
| 4 May | "Far from Home" | Daniel O'Donnell |
| 11 May | "Hand on Your Heart" | Kylie Minogue |
| 18 May | "Ferry Cross the Mersey" | Gerry Marsden, Holly Johnson, Paul McCartney & The Christians |
| 25 May | "Ferry Cross the Mersey" | Gerry Marsden, Holly Johnson, Paul McCartney & The Christians |
| 1 June | "Heart & Soul" | No Sweat |
| 8 June | "Heart & Soul" | No Sweat |
| 15 June | "Sealed With a Kiss" | Jason Donovan |
| 22 June | "All I Want Is You" | U2 |
| 29 June | "All I Want Is You" | U2 |
| 6 July | "And a Bang on the Ear" | The Waterboys |
| 13 July | "Liberian Girl" | Michael Jackson |
| 20 July | "You'll Never Stop Me Loving You" | Sonia |
| 27 July | "Too Much" | Bros |
| 3 August | "Too Much" | Bros |
| 10 August | "Swing the Mood" | Jive Bunny and the Mastermixers |
| 17 August | "Swing the Mood" | Jive Bunny and the Mastermixers |
| 24 August | "Lion in a Cage" | Dolores Keane |
| 31 August | "Lion in a Cage" | Dolores Keane |
| 7 September | "Every Day (I Love You More)" | Jason Donovan |
| 14 September | "Every Day (I Love You More)" | Jason Donovan |
| 21 September | "Right Here Waiting" | Richard Marx |
| 28 September | "Ride on Time" | Black Box |
| 5 October | "Sweet Surrender" | Wet Wet Wet |
| 12 October | "Sweet Surrender" | Wet Wet Wet |
| 19 October | "That's What I Like" | Jive Bunny and the Mastermixers |
| 26 October | "That's What I Like" | Jive Bunny and the Mastermixers |
| 2 November | "That's What I Like" | Jive Bunny and the Mastermixers |
| 9 November | "Never Too Late" | Kylie Minogue |
| 16 November | "Don't Know Much" | Linda Ronstadt & Aaron Neville |
| 23 November | "Don't Know Much" | Linda Ronstadt & Aaron Neville |
| 30 November | "Don't Know Much" | Linda Ronstadt & Aaron Neville |
| 7 December | "When You Come Back to Me" | Jason Donovan |
| 14 December | "Do They Know It's Christmas?" | Band Aid II |
| 21 December | "Do They Know It's Christmas?" | Band Aid II |
| 28 December | "Do They Know It's Christmas?" | Band Aid II |
* 31 number ones
* Most number ones: Jason Donovan (5)
* Most weeks at number one (song): "Especially for You" – Kylie Minogue and Jason Donovan, "Eternal Flame" – The Bangles, "Swing the Mood Again" – Various Artists, "Don't Know Much" – Linda Ronstadt and Aaron Neville, "Do They Know It's Christmas" – Band Aid II (3 weeks)
* Most weeks at number one (artist): Jason Donovan (8 weeks)