The Australian Top 100 Singles Chart is a chart that ranks the best-performing singles in Australia. Published by the ARIA report, the data is compiled by the Australian Recording Industry Association (ARIA) based collectively on each single's weekly physical sales. digital sales and airplay.
| The yellow background indicates the #1 song on ARIA's Years End Singles Chart of 2003. |
| Song | Artist | ||
|---|---|---|---|
| 5 January | "Lose Yourself" | Eminem | |
| 12 January | |||
| 19 January | |||
| 26 January | |||
| 2 February | |||
| 9 February | |||
| 16 February | |||
| 23 February | |||
| 2 March | "Beautiful" | Christina Aguilera | |
| 9 March | "Lost Without You" | Delta Goodrem | |
| 16 March | "All the Things She Said" | t.A.T.u. | |
| 23 March | "Lost Without You" | Delta Goodrem | |
| 30 March | "All the Things She Said" | t.A.T.u. | |
| 6 April | "In da Club" | 50 Cent | |
| 13 April | |||
| 20 April | |||
| 27 April | |||
| 4 May | |||
| 11 May | "Rock Your Body" | Justin Timberlake | |
| 18 May | "Bring Me to Life" | Evanescence featuring Paul McCoy | |
| 25 May | |||
| 1 June | |||
| 8 June | |||
| 15 June | |||
| 22 June | |||
| 29 June | "Innocent Eyes" | Delta Goodrem | |
| 6 July | |||
| 13 July | R. Kelly | ||
| 20 July | |||
| 27 July | |||
| 3 August | |||
| 10 August | |||
| 17 August | |||
| 24 August | "Where Is the Love?" | The Black Eyed Peas featuring Justin Timberlake | |
| 31 August | |||
| 7 September | |||
| 14 September | |||
| 21 September | "White Flag" | ||
| 28 September | "Not Me, Not I" | Delta Goodrem | |
| 5 October | "Where Is the Love?" | The Black Eyed Peas featuring Justin Timberlake | |
| 12 October | |||
| 19 October | "Rise Up" | ||
| 26 October | |||
| 2 November | |||
| 9 November | "Slow" | ||
| 16 November | "Me Against the Music" | Britney Spears featuring Madonna | |
| 23 November | |||
| 30 November | bgcolor=#FFFF99 rowspan="3" | "Angels Brought Me Here" | Guy Sebastian |
| 7 December | |||
| 14 December | |||
| 21 December | Delta Goodrem | ||
| 28 December | "Shut Up" | The Black Eyed Peas |