These are the Australian number-one albums of 2005, per the ARIA Charts.[1] [2]
| The yellow background indicates the #1 album on ARIA's End of Year Albums Chart of 2005. |
| Issue date | Album | Artist | Weeks at number one (total) | |
|---|---|---|---|---|
| 3 January | Greatest Hits | 9 weeks | ||
| 10 January | ||||
| 17 January | bgcolor=#FFFF99 rowspan="4" | The Sound of White | 7 weeks | |
| 24 January | ||||
| 31 January | ||||
| 7 February | ||||
| 14 February | Love. Angel. Music. Baby. | 2 weeks | ||
| 21 February | ||||
| 28 February | Hot Fuss | 1 week | ||
| 7 March | In Between Dreams | 4 weeks | ||
| 14 March | ||||
| 21 March | ||||
| 28 March | ||||
| 4 April | Anthony Callea | 3 weeks | ||
| 11 April | ||||
| 18 April | ||||
| 25 April | Two Shoes | 1 week | ||
| 2 May | ...Something to Be | 1 week | ||
| 9 May | Il Divo | 2 weeks | ||
| 16 May | ||||
| 23 May | The Sound of White | Missy Higgins | 7 weeks | |
| 30 May | Mezmerize | 1 week | ||
| 6 June | Monkey Business | 3 weeks | ||
| 13 June | X&Y | 1 week | ||
| 20 June | In Your Honor | 5 weeks | ||
| 27 June | ||||
| 4 July | ||||
| 11 July | ||||
| 18 July | ||||
| 25 July | Double Happiness | 3 weeks | ||
| 1 August | ||||
| 8 August | ||||
| 15 August | Monkey Business | The Black Eyed Peas | 3 weeks | |
| 22 August | ||||
| 29 August | Back to Bedlam | 12 weeks | ||
| 5 September | ||||
| 12 September | ||||
| 19 September | ||||
| 26 September | Have a Nice Day | 1 week | ||
| 3 October | See the Sun | 3 weeks | ||
| 10 October | ||||
| 17 October | ||||
| 24 October | Lift | 1 week | ||
| 31 October | Intensive Care | 1 week | ||
| 7 November | Tea & Sympathy | 1 week | ||
| 14 November | Ancora | Il Divo | 3 weeks | |
| 21 November | Confessions on a Dance Floor | 1 week | ||
| 28 November | Ancora | Il Divo | 3 weeks | |
| 5 December | ||||
| 12 December | 2 weeks | |||
| 19 December | 3 weeks | |||
| 26 December | ||||