The following is a list of the IRMA's number-one singles of 1999. The dates shown are Sundays.
Issue date Song ArtistRef. 3 January "Chocolate Salty Balls" Chef 10 January 17 January 24 January 31 January "Pretty Fly (For a White Guy)" The Offspring 7 February 14 February 21 February "...Baby One More Time" Britney Spears 28 February 7 March 14 March 21 March 28 March 4 April "Swear It Again" Westlife 11 April 18 April 25 April 2 May 9 May "No Scrubs" TLC 16 May 23 May "Candle for Kosovo" Rain / Various Artists 30 May 6 June "Everybody's Free (To Wear Sunscreen)" Baz Luhrmann 13 June 20 June "That Don't Impress Me Much" Shania Twain 27 June "9pm (Till I Come)" ATB 4 July 11 July 18 July 25 July "Livin' la Vida Loca" Ricky Martin 1 August "When You Say Nothing at All" Ronan Keating 8 August 15 August "If I Let You Go" Westlife 22 August 29 August "Mambo No. 5" Lou Bega 5 September 12 September 19 September "Blue (Da Ba Dee)" Eiffel 65 26 September 3 October 10 October 17 October 24 October "Flying Without Wings" Westlife 31 October 7 November 14 November 21 November "32 Counties" Dustin 28 November 5 December "Every Day I Love You" Boyzone 12 December "I Try" Macy Gray 19 December "I Have a Dream"/"Seasons In The Sun" Westlife 26 December
See also 1999 in music List of artists who reached number one in Ireland
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