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 & Jason Donovan |
| 12 January | ||
| 19 January | ||
| 26 January | "Living Years" | Mike + The Mechanics |
| 2 February | "Something's Gotten Hold of My Heart" | Marc Almond feat. Gene Pitney |
| 9 February | ||
| 16 February | "Belfast Child" | Simple Minds |
| 23 February | ||
| 2 March | "Leave Me Alone" | Michael Jackson |
| 9 March | "Too Many Broken Hearts" | Jason Donovan |
| 16 March | "Like a Prayer" | Madonna |
| 23 March | ||
| 30 March | "Paradise City" | Guns N' Roses |
| 6 April | "Eternal Flame" | The Bangles |
| 13 April | "When Love Comes to Town" | U2 feat. BB King |
| 20 April | "Eternal Flame" | The Bangles |
| 27 April | ||
| 4 May | "Far from Home" | Daniel O'Donnell |
| 11 May | "Hand on Your Heart" | Kylie Minogue |
| 18 May | "Ferry Cross the Mersey" | Holly Johnson, Paul McCartney & Various |
| 25 May | ||
| 1 June | "Heart & Soul" | No Sweat |
| 8 June | ||
| 15 June | "Sealed With a Kiss" | Jason Donovan |
| 22 June | "All I Want Is You" | U2 |
| 29 June | ||
| 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 | ||
| 10 August | Swing the Mood | Jive Bunny & The Mastermixers |
| 17 August | Swing the Mood | Jive Bunny & 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 & The Mastermixers |
| 26 October | That's What I Like | Jive Bunny & The Mastermixers |
| 2 November | That's What I Like | Jive Bunny & 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 Jaso Donovan, "Eternal Flame" - The Bangles, "That's What I Like" - Jive Bunny and the Mastermixers, "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)