# List of number-one singles of 2021 (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 the weekly physical and digital sales and streams of singles. In 2021, 13 songs reached number one; the first, "Mood" by 24kGoldn featuring Iann Dior, returned to the top on the first chart of the year after spending nine weeks atop the chart in 2020. Eight artists, Olivia Rodrigo, Glass Animals, Daniel Caesar, Giveon, the Kid Laroi, Russ Millions, Tion Wayne and Dua Lipa reached the top for the first time.
Olivia Rodrigo and the Kid Laroi each achieved two number ones on the chart in 2021, while Justin Bieber spent the most weeks at number one of the year, with "Peaches" and the Kid Laroi duet "Stay" spending a combined total of 16 weeks atop the chart.

## Chart history

Key :
| † | Indicates best-performing single of 2021 |
| Issue date | Song | Artist(s) |
| 4 January | "Mood" | 24kGoldn featuring Iann Dior |
| 11 January | "Mood" | 24kGoldn featuring Iann Dior |
| 18 January | "Drivers License" | Olivia Rodrigo |
| 25 January | "Drivers License" | Olivia Rodrigo |
| 1 February | "Drivers License" | Olivia Rodrigo |
| 8 February | "Drivers License" | Olivia Rodrigo |
| 15 February | "Drivers License" | Olivia Rodrigo |
| 22 February | "Drivers License" | Olivia Rodrigo |
| 1 March | "Heat Waves" † | Glass Animals |
| 8 March | "Heat Waves" † | Glass Animals |
| 15 March | "Heat Waves" † | Glass Animals |
| 22 March | "Heat Waves" † | Glass Animals |
| 29 March | "Heat Waves" † | Glass Animals |
| 5 April | "Heat Waves" † | Glass Animals |
| 12 April | "Peaches" | Justin Bieber featuring Daniel Caesar and Giveon |
| 19 April | "Peaches" | Justin Bieber featuring Daniel Caesar and Giveon |
| 26 April | "Montero (Call Me by Your Name)" | Lil Nas X |
| 3 May | "Montero (Call Me by Your Name)" | Lil Nas X |
| 10 May | "Without You" | The Kid Laroi |
| 17 May | "Body" | Russ Millions and Tion Wayne |
| 24 May | "Body" | Russ Millions and Tion Wayne |
| 31 May | "Good 4 U" | Olivia Rodrigo |
| 7 June | "Good 4 U" | Olivia Rodrigo |
| 14 June | "Good 4 U" | Olivia Rodrigo |
| 21 June | "Good 4 U" | Olivia Rodrigo |
| 28 June | "Good 4 U" | Olivia Rodrigo |
| 5 July | "Bad Habits" | Ed Sheeran |
| 12 July | "Bad Habits" | Ed Sheeran |
| 19 July | "Stay" | The Kid Laroi and Justin Bieber |
| 26 July | "Stay" | The Kid Laroi and Justin Bieber |
| 2 August | "Stay" | The Kid Laroi and Justin Bieber |
| 9 August | "Stay" | The Kid Laroi and Justin Bieber |
| 16 August | "Stay" | The Kid Laroi and Justin Bieber |
| 23 August | "Stay" | The Kid Laroi and Justin Bieber |
| 30 August | "Stay" | The Kid Laroi and Justin Bieber |
| 6 September | "Stay" | The Kid Laroi and Justin Bieber |
| 13 September | "Stay" | The Kid Laroi and Justin Bieber |
| 20 September | "Stay" | The Kid Laroi and Justin Bieber |
| 27 September | "Stay" | The Kid Laroi and Justin Bieber |
| 4 October | "Stay" | The Kid Laroi and Justin Bieber |
| 11 October | "Stay" | The Kid Laroi and Justin Bieber |
| 18 October | "Stay" | The Kid Laroi and Justin Bieber |
| 25 October | "Easy on Me" | Adele |
| 1 November | "Easy on Me" | Adele |
| 8 November | "Cold Heart (Pnau remix)" | Elton John and Dua Lipa |
| 15 November | "Cold Heart (Pnau remix)" | Elton John and Dua Lipa |
| 22 November | "All Too Well (Taylor's Version)" | Taylor Swift |
| 29 November | "Easy on Me" | Adele |
| 6 December | "Easy on Me" | Adele |
| 13 December | "Cold Heart (Pnau remix)" | Elton John and Dua Lipa |
| 20 December | "Cold Heart (Pnau remix)" | Elton John and Dua Lipa |
| 27 December | "Cold Heart (Pnau remix)" | Elton John and Dua Lipa |

## Number-one artists

List of number-one artists, with total weeks spent at number one shown :
| Position | Artist | Weeks at No. 1 |
| 1 | Justin Bieber | 16 |
| 2 | The Kid Laroi | 15 |
| 3 | Olivia Rodrigo | 11 |
| 4 | Glass Animals | 6 |
| 5 | Dua Lipa | 5 |
| 5 | Elton John | 5 |
| 6 | Adele | 4 |
| 7 | 24kGoldn | 2 |
| 7 | Iann Dior | 2 |
| 7 | Daniel Caesar | 2 |
| 7 | Giveon | 2 |
| 7 | Lil Nas X | 2 |
| 7 | Russ Millions | 2 |
| 7 | Tion Wayne | 2 |
| 7 | Ed Sheeran | 2 |
| 8 | Taylor Swift | 1 |