List of number-one singles of 2019 (Hypothetical version)

The ARIA Singles Chart ranks the best-performing singles in Australia. Its data is based collectively on the weekly physical and digital sales and streams of singles, as well as Airplay. 22 Songs topped the chart in 2019, a 23rd single, Happier, began it's run in October of 2018. 14 artists reached the top spot for the first time, Panic! at the disco, Ava Max, Bradley Cooper, Billie Eilish, Lil Nas X, Billy Ray Cyrus, Mabel, Tiësto, Jonas Blue, Lizzo, Lana Del Rey, Kygo, Lewis Capaldi, and Tones and I.


 * Bold songs - Debut at number 1

Chart history
{| class="wikitable plainrowheaders" style="text-align: center" !Issue date !Song !Artist(s) ! scope="row" | 7 January ! scope="row" | 14 January ! scope="row" | 21 January ! scope="row" | 28 January ! scope="row" | 4 Feburary ! scope="row" | 11 Feburary ! scope="row" | 18 Feburary ! scope="row" | 25 Feburary ! scope="row" | 4 March ! scope="row" | 11 March ! scope="row" | 18 March ! scope="row" | 25 March ! scope="row" | 1 April ! scope="row" | 8 April ! scope="row" | 15 April ! scope="row" | 22 April ! scope="row" | 29 April ! scope="row" | 6 May ! scope="row" | 13 May ! scope="row" | 20 May ! scope="row" | 27 May ! scope="row" | 3 June ! scope="row" | 10 June ! scope="row" | 17 June ! scope="row" | 24 June ! scope="row" | 30 June ! scope="row" | 8 July ! scope="row" | 15 July ! scope="row" | 22 July ! scope="row" | 29 July ! scope="row" | 5 August ! scope="row" | 12 August ! scope="row" | 19 August ! scope="row" | 26 August ! scope="row" | 2 September ! scope="row"| 9 September ! scope="row"| 16 September ! scope="row"| 23 September ! scope="row"| 30 September ! scope="row"| 7 October ! scope="row"| 14 October ! scope="row"| 21 October ! scope="row"| 28 October ! scope="row"| 4 November ! scope="row"| 11 November ! scope="row"| 18 November ! scope="row"| 25 November ! scope="row"| 2 December ! scope="row"| 9 December ! scope="row"| 16 December ! scope="row"| 23 December ! scope="row"| 30 December
 * Happier
 * Marshmello and Bastille
 * Thank U, Next
 * Ariana Grande
 * Happier
 * Marshmello and Bastille
 * Happier
 * Marshmello and Bastille
 * High Hopes
 * Panic! at the Disco
 * Thank U, Next
 * Ariana Grande
 * 7 rings
 * Ariana Grande
 * style="background-color:#FFFF99"|Sweet But Psycho
 * Ava Max
 * style="background-color:#FFFF99"|Sweet But Psycho
 * Ava Max
 * style="background-color:#FFFF99"|Sweet But Psycho
 * Ava Max
 * style="background-color:#FFFF99"|Sweet But Psycho
 * Ava Max
 * style="background-color:#FFFF99"|Sweet But Psycho
 * Ava Max
 * Congratulations
 * Joel Berghult & Boyinaband & Pewdiepie
 * Sucker
 * Jonas Brothers
 * Bad Guy
 * Billie Eilish
 * Old Town Road
 * Lil Nas X
 * Old Town Road
 * Lil Nas X & Billy Ray Cyrus
 * Old Town Road
 * Lil Nas X & Billy Ray Cyrus
 * So Am I
 * Ava Max
 * So Am I
 * Ava Max
 * So Am I
 * Ava Max
 * Don't Call Me Up
 * Mabel
 * Don't Call Me Up
 * Mabel
 * So Am I
 * Ava Max
 * You Need To Calm Down
 * Taylor Swift
 * You Need To Calm Down
 * Taylor Swift
 * Señorita
 * Shawn Mendes and Camila Cabello
 * Señorita
 * Shawn Mendes and Camila Cabello
 * Señorita
 * Shawn Mendes and Camila Cabello
 * Señorita
 * Shawn Mendes and Camila Cabello
 * Call You Mine
 * The Chainsmokers and Bebe Rexha
 * Call You Mine
 * The Chainsmokers and Bebe Rexha
 * Ritual
 * Tiësto,Jonas Blue and Rita Ora
 * Ritual
 * Tiësto,Jonas Blue and Rita Ora
 * Ritual
 * Tiësto,Jonas Blue and Rita Ora
 * Truth Hurts
 * Lizzo
 * Torn
 * Ava Max
 * Torn
 * Ava Max
 * Torn
 * Ava Max
 * Torn
 * Ava Max
 * Don't Call Me Angel
 * Ariana Grande, Miley Cyrus and Lana Del Rey
 * Don't Call Me Angel
 * Ariana Grande, Miley Cyrus and Lana Del Rey
 * Don't Call Me Angel
 * Ariana Grande, Miley Cyrus and Lana Del Rey
 * Higher Love
 * Kygo & Whitney Houston
 * God Is a Dancer
 * Tiësto, Mabel
 * God Is a Dancer
 * Tiësto, Mabel
 * Someone You Loved
 * Lewis Capaldi
 * Someone You Loved
 * Lewis Capaldi
 * Memories
 * Maroon 5
 * Everything I wanted
 * Billie Eilish
 * Someone You Loved
 * Lewis Capaldi
 * Dance Monkey
 * Tones and I