ARC Weekly Top 40 number-one hits of 2005 (U.S.)
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These are the ARC Weekly Top 40 number 1 hits of 2005
| Issue Date | Song | Artist |
| January 1 | Let Me Love You | Mario |
| January 8 | Let Me Love You | Mario |
| January 15 | Let Me Love You | Mario |
| January 22 | Let Me Love You | Mario |
| January 29 | Let Me Love You | Mario |
| February 5 | 1, 2 Step | Ciara featuring Missy Elliot |
| February 12 | 1,2 Step | Ciara featuring Missy Elliot |
| February 19 | Since U Been Gone | Kelly Clarkson |
| February 26 | Boulevard of Broken Dreams | Green Day |
| March 5 | Boulevard of Broken Dreams | Green Day |
| March 19 | Since U Been Gone | Kelly Clarkson |
| March 26 | Since U Been Gone | Kelly Clarkson |
| April 2 | Since U Been Gone | Kelly Clarkson |
| April 9 | Since U Been Gone | Kelly Clarkson |
| April 16 | Since U Been Gone | Kelly Clarkson |
| April 23 | Since U Been Gone | Kelly Clarkson |
| April 30 | Since U Been Gone | Kelly Clarkson |
| May 7 | Hollaback Girl | Gwen Stefani |
| May 14 | Hollaback Girl | Gwen Stefani |
| May 21 | Hollaback Girl | Gwen Stefani |
| May 28 | Hollaback Girl | Gwen Stefani |
| June 4 | Hollaback Girl | Gwen Stefani |
| June 11 | Hollaback Girl | Gwen Stefani |
| June 18 | We Belong Together | Mariah Carey |
| June 25 | We Belong Together | Mariah Carey |
| July 2 | We Belong Together | Mariah Carey |
| July 9 | We Belong Together | Mariah Carey |
| July 16 | We Belong Together | Mariah Carey |
| July 23 | We Belong Together | Mariah Carey |
| July 30 | We Belong Together | Mariah Carey |
| August 6 | We Belong Together | Mariah Carey |
| August 13 | Don't Cha | Pussycat Dolls |
| August 20 | Don't Cha | Pussycat Dolls |
| August 27 | We Belong Together | Mariah Carey |
| September 3 | We Belong Together | Mariah Carey |
| September 10 | Listen To Your Heart | D.H.T. |
| September 17 | Pon De Replay | Rihanna |
| September 24 | Shake It Off | Mariah Carey |
| October 1 | Shake It Off | Mariah Carey |
| October 8 | Shake It Off | Mariah Carey |
| October 15 | Because of You | Kelly Clarkson |
| October 22 | Because of You | Kelly Clarkson |
| October 29 | Gold Digger | Kanye West featuring Jamie Foxx |
| November 5 | Gold Digger | Kanye West featuring Jamie Foxx |
| November 12 | Because of You | Kelly Clarkson |
| November 19 | Because of You | Kelly Clarkson |
| November 26 | Because of You | Kelly Clarkson |
| December 3 | Run It! | Chris Brown |
| December 10 | Run It! | Chris Brown |
| December 17 | Run It! | Chris Brown |
| December 24 | Don't Forget About Us | Mariah Carey |
| December 31 | Don't Forget About Us | Mariah Carey |
