List of number-one singles of 1989 (Ireland)

The following is a list of the IRMA's number-one singles of 1989.


 * 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)