List of number-one albums of 2009 (Australia)

The highest-selling albums in Australia are ranked in the Australian Recording Industry Association albums chart, also known as the ARIA Charts, published by the Australian Recording Industry Association (ARIA).

The data are compiled from a sample that includes music stores, music departments at electronics and department stores, and Internet sales (in other words, both digital as well as CD sales).

Alternative rock band Kings of Leon's Only by the Night had the longest non-consecutive run among the releases that reached peak position in 2009; it spent 14 non-consecutive weeks atop the chart, beginning in the 2008 chart year and continuing until 13 April, with a break between 16 February and 23 March.

The Essential Michael Jackson by Michael Jackson, and I Dreamed a Dream by Susan Boyle had the longest consecutive run atop the chart, spending 7 weeks each at number one.

During 2009, six acts received their first Australian number one album, these being Lily Allen, Natalie Bassingthwaighte, Paramore, Ronan Keating, Short Stack and Susan Boyle.

A woman with long black hair wearing a black scarf and jacket
Susan Boyle had one of the two longest runs at number one in 2009, as well as reaching number one on the end of year albums chart with I Dreamed a Dream .
Two men playing guitars in concert
The Kings of Leon has the album with the longest stay at number one in 2009 with Only by the Night .