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, "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)