These are the Top 25 singles of 1999 in Australia from the Australian Recording Industry Association (ARIA) End of Year singles chart.
"Mambo No. 5" by Lou Bega was the biggest song of the year, peaking at #1 for eight weeks and staying in the top 50 for 17 weeks. The longest stay at #1 was by Britney Spears with "...Baby One More Time" which spent 9 weeks at the top spot.
- ^ "Mambo No. 5" entered the charts in January, 1998 and reached #1 in February, 1988, where it remained for nine weeks. The song stayed in the charts for 17 weeks.
- ^ "...Baby One More Time" entered the charts in September, 1998 and reached #1 in its second week in the charts, where it remained for eight weeks. The song stayed in the charts for 23 weeks.
- ^ "Blue (Da Ba Dee)" spent seven weeks at the top spot in 1999 and two weeks in 2000. The song stayed in the charts for a total of 24 weeks.
- ^ "Pretty Fly (For a White Guy)" reached #1 in December, 1998 and remained in that spot for six weeks until January, 1999. The song stayed in the charts for 22 weeks.