These are the number-one songs of 2005 in the Australian ARIA singles chart.
| The yellow background indicates the #1 song on ARIA's End of Year Singles Chart of 2005. |
| Song | Artist | ||
|---|---|---|---|
| 2 January | bgcolor=#FFFF99 rowspan="3" | "The Prayer" | |
| 9 January | |||
| 16 January | |||
| 23 January | "Nasty Girl" | Nitty | |
| 30 January | |||
| 6 February | "Over and Over" | Nelly featuring Tim McGraw | |
| 13 February | |||
| 20 February | |||
| 27 February | |||
| 6 March | |||
| 13 March | "Almost Here" | Brian McFadden and Delta Goodrem | |
| 20 March | "Rain"/"Bridge over Troubled Water" | Anthony Callea | |
| 27 March | |||
| 3 April | "Beautiful Soul" | ||
| 10 April | |||
| 17 April | |||
| 24 April | |||
| 1 May | "Signs" | Snoop Dogg featuring Justin Timberlake and Charlie Wilson | |
| 8 May | |||
| 15 May | "Switch" | Will Smith | |
| 22 May | "Don't Phunk with My Heart" | The Black Eyed Peas | |
| 29 May | "Hollaback Girl" | Gwen Stefani | |
| 5 June | "Don't Phunk with My Heart" | Black Eyed Peas | |
| 12 June | |||
| 19 June | "Incomplete" | Backstreet Boys | |
| 26 June | "We Belong Together" | Mariah Carey | |
| 3 July | |||
| 10 July | "Lonely" | Akon | |
| 17 July | |||
| 24 July | "Axel F" | Crazy Frog | |
| 31 July | |||
| 7 August | |||
| 14 August | "Lonely" | Akon | |
| 21 August | "Ghetto Gospel" | 2Pac featuring Elton John | |
| 28 August | "Don't Cha" | The Pussycat Dolls featuring Busta Rhymes | |
| 4 September | |||
| 11 September | |||
| 18 September | |||
| 25 September | |||
| 2 October | "Shine" | Shannon Noll | |
| 9 October | "Don't Cha" | Pussycat Dolls featuring Busta Rhymes | |
| 16 October | |||
| 23 October | "Gold Digger" | Kanye West featuring Jamie Foxx | |
| 30 October | |||
| 6 November | |||
| 13 November | "Hung Up" | Madonna | |
| 20 November | "My Humps" | The Black Eyed Peas | |
| 27 November | |||
| 4 December | "Maybe Tonight" | Kate DeAraugo | |
| 11 December | |||
| 18 December | "Wasabi"/"Eye of the Tiger" | Lee Harding | |
| 25 December |
| Position | Artist | Weeks #1 | |
|---|---|---|---|
| 1 | 7 | ||
| 1 | Busta Rhymes (as featuring) | 7 | |
| 2 | 5 | ||
| 2 | 5 | ||
| 2 | Tim McGraw (as featuring) | 5 | |
| 2 | 5 | ||
| 3 | 4 | ||
| 4 | 3 | ||
| 4 | 3 | ||
| 4 | 3 | ||
| 4 | Jamie Foxx (as featuring) | 3 | |
| 5 | 2 | ||
| 5 | 2 | ||
| 5 | Justin Timberlake (as featuring) | 2 | |
| 5 | Charlie Wilson (as featuring) | 2 | |
| 5 | 2 | ||
| 5 | 2 | ||
| 5 | 2 | ||
| 6 | 1 | ||
| 6 | 1 | ||
| 6 | 1 | ||
| 6 | 1 | ||
| 6 | 1 | ||
| 6 | 1 | ||
| 6 | Elton John (as featuring) | 1 | |
| 6 | 1 | ||
| 6 | 1 |