These are the Australian number-one albums of 2005, per the ARIA Charts.
| Issue Date | Album | Artist | Weeks at number one (total) |
| 3 January | Greatest Hits | Robbie Williams | 9 weeks |
| 10 January | Greatest Hits | Robbie Williams | 9 weeks |
| 17 January | The Sound of White | Missy Higgins | 7 weeks |
| 24 January | The Sound of White | Missy Higgins | 7 weeks |
| 31 January | The Sound of White | Missy Higgins | 7 weeks |
| 7 February | The Sound of White | Missy Higgins | 7 weeks |
| 14 February | Love. Angel. Music. Baby. | Gwen Stefani | 2 weeks |
| 21 February | Love. Angel. Music. Baby. | Gwen Stefani | 2 weeks |
| 28 February | Hot Fuss | The Killers | 1 week |
| 7 March | In Between Dreams | Jack Johnson | 4 weeks |
| 14 March | In Between Dreams | Jack Johnson | 4 weeks |
| 21 March | In Between Dreams | Jack Johnson | 4 weeks |
| 28 March | In Between Dreams | Jack Johnson | 4 weeks |
| 4 April | Anthony Callea | Anthony Callea | 3 weeks |
| 11 April | Anthony Callea | Anthony Callea | 3 weeks |
| 18 April | Anthony Callea | Anthony Callea | 3 weeks |
| 25 April | Two Shoes | The Cat Empire | 1 week |
| 2 May | …Something to Be | Rob Thomas | 1 week |
| 9 May | Il Divo | Il Divo | 2 weeks |
| 16 May | Il Divo | Il Divo | 2 weeks |
| 23 May | The Sound of White | Missy Higgins | 7 weeks |
| 30 May | Mezmerize | System of a Down | 1 week |
| 6 June | Monkey Business | The Black Eyed Peas | 3 weeks |
| 13 June | X&Y | Coldplay | 1 week |
| 20 June | In Your Honor | Foo Fighters | 5 weeks |
| 27 June | In Your Honor | Foo Fighters | 5 weeks |
| 4 July | In Your Honor | Foo Fighters | 5 weeks |
| 11 July | In Your Honor | Foo Fighters | 5 weeks |
| 18 July | In Your Honor | Foo Fighters | 5 weeks |
| 25 July | Double Happiness | Jimmy Barnes | 3 weeks |
| 1 August | Double Happiness | Jimmy Barnes | 3 weeks |
| 8 August | Double Happiness | Jimmy Barnes | 3 weeks |
| 15 August | Monkey Business | The Black Eyed Peas | 3 weeks |
| 22 August | Monkey Business | The Black Eyed Peas | 3 weeks |
| 29 August | Back to Bedlam | James Blunt | 12 weeks |
| 5 September | Back to Bedlam | James Blunt | 12 weeks |
| 12 September | Back to Bedlam | James Blunt | 12 weeks |
| 19 September | Back to Bedlam | James Blunt | 12 weeks |
| 26 September | Have a Nice Day | Bon Jovi | 1 week |
| 3 October | See the Sun | Pete Murray | 3 weeks |
| 10 October | See the Sun | Pete Murray | 3 weeks |
| 17 October | See the Sun | Pete Murray | 3 weeks |
| 24 October | Lift | Shannon Noll | 1 week |
| 31 October | Intensive Care | Robbie Williams | 1 week |
| 7 November | Tea & Sympathy | Bernard Fanning | 1 week |
| 14 November | Ancora | Il Divo | 3 weeks |
| 21 November | Confessions on a Dance Floor | Madonna | 1 week |
| 28 November | Ancora | Il Divo | 3 weeks |
| 5 December | Ancora | Il Divo | 3 weeks |
| 12 December | Curtain Call: The Hits | Eminem | 2 weeks |
| 19 December | Reach Out: The Motown Record | Human Nature | 3 weeks |
| 26 December | Reach Out: The Motown Record | Human Nature | 3 weeks |
Famous quotes containing the words list, number-one:
“My list of things I never pictured myself saying when I pictured myself as a parent has grown over the years.”
—Polly Berrien Berends (20th century)
“I’m your number-one fan.”
—William Goldman (b. 1931)