List of number-one singles of 2009 (Australia)

Its data, published by the Australian Recording Industry Association, is based collectively on each single's weekly physical and digital sales.

[1] In 2009, 14 singles claimed the top spot, including Lady Gaga's "Poker Face", which started its peak position in late 2008.

Seven acts achieved their first number-one single in Australia, either as a lead or featured artist: Jessica Mauboy, The Fray, Taylor Swift, A. R. Rahman, Nicole Scherzinger, David Guetta, Vanessa Amorosi and Kesha.

[2] The Black Eyed Peas earned three number-one singles during the year for "Boom Boom Pow", "I Gotta Feeling" and "Meet Me Halfway".

[3] Flo Rida's "Right Round", The Black Eyed Peas' "I Gotta Feeling", and Guetta's "Sexy Bitch" each spent seven weeks at the number-one spot.

The Black Eyed Peas achieved three number-one singles in 2009 for " Boom Boom Pow ", " I Gotta Feeling " and " Meet Me Halfway ", spanning 14 weeks in total at number-one on the chart.
Kesha 's " Tik Tok " was the longest running number-one single of 2009, having topped the ARIA Singles Chart for eight consecutive weeks.
Flo Rida 's " Right Round " topped the ARIA Singles Chart for seven weeks, becoming his second number-one single on the chart.
David Guetta 's " Sexy Bitch " topped the ARIA Singles Chart for seven weeks, becoming his first number-one single on the chart.
Indigenous Australian artist Jessica Mauboy earned her first number-one single on the chart, Burn , in 2009.