These are the Australian number-one albums of 2004, per the ARIA Charts.
| Issue Date | Album | Artist | Weeks at number one (total) |
| 5 January | Just As I Am | Guy Sebastian | 4 weeks |
| 12 January | Innocent Eyes | Delta Goodrem | 29 weeks |
| 19 January | Innocent Eyes | Delta Goodrem | 29 weeks |
| 26 January | Fallen | Evanescence | 3 weeks |
| 2 February | Fallen | Evanescence | 3 weeks |
| 9 February | Fallen | Evanescence | 3 weeks |
| 16 February | That's What I'm Talking About | Shannon Noll | 4 weeks |
| 23 February | That's What I'm Talking About | Shannon Noll | 4 weeks |
| 1 March | That's What I'm Talking About | Shannon Noll | 4 weeks |
| 8 March | That's What I'm Talking About | Shannon Noll | 4 weeks |
| 15 March | Sunrise Over Sea | The John Butler Trio | 3 weeks |
| 22 March | Sunrise Over Sea | The John Butler Trio | 3 weeks |
| 29 March | Feeler | Pete Murray | 5 weeks |
| 5 April | Feeler | Pete Murray | 5 weeks |
| 12 April | Feeler | Pete Murray | 5 weeks |
| 19 April | Feeler | Pete Murray | 5 weeks |
| 19 April | Feeler | Pete Murray | 5 weeks |
| 26 April | Anastacia | Anastacia | 2 weeks |
| 3 May | [[Anastacia (album)] | Anastacia | 1 week |
| 10 May | Michael Bublé | Michael Bublé | 2 weeks |
| 17 May | Get Born | Jet | 2 weeks |
| 24 May | Get Born | Jet | 2 weeks |
| 31 May | Under My Skin | Avril Lavigne | 1 week |
| 7 June | Wayward Angel | Kasey Chambers | 5 weeks |
| 14 June | Wayward Angel | Kasey Chambers | 5 weeks |
| 21 June | Wayward Angel | Kasey Chambers | 5 weeks |
| 28 June | Wayward Angel | Kasey Chambers | 5 weeks |
| 5 July | Wayward Angel | Kasey Chambers | 5 weeks |
| 12 July | For All You've Done | Hillsong Church | 1 week |
| 19 July | Sunrise Over Sea | The John Butler Trio | 3 weeks |
| 26 July | Shrek 2 | Soundtrack | 1 week |
| 2 August | One Determined Heart | Paulini | 2 weeks |
| 9 August | One Determined Heart | Paulini | 2 weeks |
| 16 August | Anastacia | Anastacia | 2 weeks |
| 23 August | Elephunk | The Black Eyed Peas | 1 week |
| 30 August | Classified | bond | 1 week |
| 6 September | Michael Bublé | Michael Bublé | 2 weeks |
| 13 September | The Sound of White | Missy Higgins | 7 weeks |
| 20 September | The Sound of White | Missy Higgins | 7 weeks |
| 27 September | American Idiot | Green Day | 2 weeks |
| 4 October | American Idiot | Green Day | 2 weeks |
| 11 October | The Chronicles of Life and Death | Good Charlotte | 1 week |
| 18 October | Songs About Jane | Maroon 5 | 1 week |
| 25 October | Greatest Hits | Robbie Williams | 9 weeks |
| 1 November | Greatest Hits | Robbie Williams | 9 weeks |
| 8 November | Greatest Hits | Robbie Williams | 9 weeks |
| 15 November | Mistaken Identity | Delta Goodrem | 1 week |
| 22 November | Encore | Eminem | 1 week |
| 29 November | How to Dismantle an Atomic Bomb | U2 | 1 week |
| 6 December | Greatest Hits | Robbie Williams | 9 weeks |
| 13 December | Greatest Hits | Robbie Williams | 9 weeks |
| 20 December | Greatest Hits | Robbie Williams | 9 weeks |
| 27 December | Greatest Hits | Robbie Williams | 9 weeks |
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