These are the number-one songs of 2004 in the Australian ARIA singles chart.
| The yellow background indicates the #1 song on ARIA's End of Year Singles Chart of 2004. |
| Week beginning | Song | Artist | |
|---|---|---|---|
| 4 January | "Shut Up" | The Black Eyed Peas | |
| 11 January | |||
| 18 January | "Hey Ya!" | ||
| 25 January | |||
| 1 February | bgcolor=#FFFF99 rowspan="4" | "What About Me" | |
| 8 February | |||
| 15 February | |||
| 22 February | |||
| 29 February | "All I Need Is You" | Guy Sebastian | |
| 7 March | "Superstar" | Jamelia | |
| 14 March | "Toxic" | Britney Spears | |
| 21 March | |||
| 28 March | "Yeah!" | Usher featuring Lil Jon and Ludacris | |
| 4 April | "Fuck It (I Don't Want You Back)" | Eamon | |
| 11 April | |||
| 18 April | |||
| 25 April | |||
| 2 May | "My Band" | D12 | |
| 9 May | "Left Outside Alone" | Anastacia | |
| 16 May | "My Band" | D12 | |
| 23 May | "Black Betty" | Spiderbait | |
| 30 May | |||
| 6 June | |||
| 13 June | "F.U.R.B. (Fuck You Right Back)" | Frankee | |
| 20 June | |||
| 27 June | "Everytime" | Britney Spears | |
| 4 July | "F.U.R.B. (Fuck You Right Back)" | Frankee | |
| 11 July | "Learn to Fly" | ||
| 18 July | "Angel Eyes" | Paulini | |
| 25 July | |||
| 1 August | |||
| 8 August | "Scar" | Missy Higgins | |
| 15 August | "When the War Is Over"/ "One Night Without You" | Cosima | |
| 22 August | |||
| 29 August | "My Place/Flap Your Wings" | Nelly featuring Jaheim | |
| 5 September | "She Will Be Loved" | Maroon 5 | |
| 12 September | |||
| 19 September | |||
| 26 September | |||
| 3 October | "Out with My Baby" | Guy Sebastian | |
| 10 October | "She Will Be Loved" | Maroon 5 | |
| 17 October | "Out of the Blue" | Delta Goodrem | |
| 24 October | |||
| 31 October | |||
| 7 November | "Just Lose It" | Eminem | |
| 14 November | "What You Waiting For?" | Gwen Stefani | |
| 21 November | |||
| 28 November | "These Kids" | Joel Turner and the Modern Day Poets | |
| 5 December | "Listen with Your Heart" | Casey Donovan | |
| 12 December | |||
| 19 December | "The Prayer" | Anthony Callea | |
| 26 December |