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The following is a list of the IRMA's number-one singles of 1999. The dates shown are Sundays.
Contents
| Issue date | Song | Artist | Ref. |
|---|---|---|---|
| 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 | [1] |
| 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 |