List of number-one singles of 2012 (Australia)
The ARIA Singles Chart ranks the best-performing singles in Australia. Its data, published by the Australian Recording Industry Association, is based collectively on each single's weekly physical and digital sales. In 2012, seventeen singles claimed the top spot, including LMFAO's "Sexy and I Know It", which started its peak position in late 2011. Seventeen acts achieved their first number-one single in Australia, either as a lead or featured artist: Foster the People, Sia, Gym Class Heroes, Neon Hitch, Fun, Janelle Monáe, Carly Rae Jepsen, Karise Eden, Justice Crew, Lupe Fiasco, Psy, Swedish House Mafia, John Martin, Samantha Jade, Macklemore, Ryan Lewis and Wanz.
Fun and Flo Rida earned two number-one songs during the year. Flo Rida's "Whistle" was the longest-running number-one single of 2012, having topped the ARIA Singles Chart for eight weeks. Carly Rae Jepsen's "Call Me Maybe" and Macklemore and Ryan Lewis' "Thrift Shop" each topped the chart for five consecutive weeks, while Flo Rida's "Wild Ones", Psy's "Gangnam Style" and Guy Sebastian's "Battle Scars" all stayed at number one for six consecutive weeks. Sebastian is the only Australian male artist in the chart's history to achieve six number-one singles.
Chart history
| Date | Song | Artist | Ref. |
| 2 January | "Sexy and I Know It" | LMFAO | |
| 9 January | "Sexy and I Know It" | LMFAO | |
| 16 January | "Pumped Up Kicks" | Foster the People | |
| 23 January | "Wild Ones" | Flo Rida featuring Sia | |
| 30 January | "Wild Ones" | Flo Rida featuring Sia | |
| 6 February | "Wild Ones" | Flo Rida featuring Sia | |
| 13 February | "Wild Ones" | Flo Rida featuring Sia | |
| 20 February | "Wild Ones" | Flo Rida featuring Sia | |
| 27 February | "Wild Ones" | Flo Rida featuring Sia | |
| 5 March | "Ass Back Home" | Gym Class Heroes featuring Neon Hitch | |
| 12 March | "We Are Young" | Fun featuring Janelle Monáe | |
| 19 March | "We Are Young" | Fun featuring Janelle Monáe | |
| 26 March | "We Are Young" | Fun featuring Janelle Monáe | |
| 2 April | "Call Me Maybe" | Carly Rae Jepsen | |
| 9 April | "Call Me Maybe" | Carly Rae Jepsen | |
| 16 April | "Call Me Maybe" | Carly Rae Jepsen | |
| 23 April | "Call Me Maybe" | Carly Rae Jepsen | |
| 30 April | "Call Me Maybe" | Carly Rae Jepsen | |
| 7 May | "Whistle" | Flo Rida | |
| 14 May | "Whistle" | Flo Rida | |
| 21 May | "Whistle" | Flo Rida | |
| 28 May | "Whistle" | Flo Rida | |
| 4 June | "Whistle" | Flo Rida | |
| 11 June | "Whistle" | Flo Rida | |
| 18 June | "Whistle" | Flo Rida | |
| 25 June | "Stay with Me Baby" | Karise Eden | |
| 2 July | "Whistle" | Flo Rida | |
| 9 July | "Shout It Out" | Reece Mastin | |
| 16 July | "Blow Me " | Pink | |
| 23 July | "Some Nights" | Fun | |
| 30 July | "Some Nights" | Fun | |
| 6 August | "Boom Boom" | Justice Crew | |
| 13 August | "Boom Boom" | Justice Crew | |
| 20 August | "Battle Scars" | Guy Sebastian and Lupe Fiasco | |
| 27 August | "Battle Scars" | Guy Sebastian and Lupe Fiasco | |
| 3 September | "Battle Scars" | Guy Sebastian and Lupe Fiasco | |
| 10 September | "Battle Scars" | Guy Sebastian and Lupe Fiasco | |
| 17 September | "Battle Scars" | Guy Sebastian and Lupe Fiasco | |
| 24 September | "Battle Scars" | Guy Sebastian and Lupe Fiasco | |
| 1 October | "Gangnam Style" | Psy | |
| 8 October | "Gangnam Style" | Psy | |
| 15 October | "Gangnam Style" | Psy | |
| 22 October | "Gangnam Style" | Psy | |
| 29 October | "Gangnam Style" | Psy | |
| 5 November | "Gangnam Style" | Psy | |
| 12 November | "Don't You Worry Child" | Swedish House Mafia featuring John Martin | |
| 19 November | "Don't You Worry Child" | Swedish House Mafia featuring John Martin | |
| 26 November | "What You've Done to Me" | Samantha Jade | |
| 3 December | "Thrift Shop" | Macklemore and Ryan Lewis featuring Wanz | |
| 10 December | "Thrift Shop" | Macklemore and Ryan Lewis featuring Wanz | |
| 17 December | "Thrift Shop" | Macklemore and Ryan Lewis featuring Wanz | |
| 24 December | "Thrift Shop" | Macklemore and Ryan Lewis featuring Wanz | |
| 31 December | "Thrift Shop" | Macklemore and Ryan Lewis featuring Wanz |