The Billboard Hot 100 Chart is published weekly by Billboard Magazine and is the industry standard for determining the most popular songs in the United States for a given week.
Below are the singles that were number one every week in 2005; such as "Gold Digger" by Kanye West and "Candy Shop" by 50 Cent.
According to Billboard Magazine, the top song of 2005 was "We Belong Together" by Mariah Carey.
| Date | Song | Artist | |
| 2005-12-31 | Don't Forget About Us | Mariah Carey | |
| 2005-12-24 | Run It! | Chris Brown | |
| 2005-12-17 | Run It! | Chris Brown | |
| 2005-12-10 | Run It! | Chris Brown | |
| 2005-12-03 | Run It! | Chris Brown | |
| 2005-11-26 | Run It! | Chris Brown | |
| 2005-11-19 | Gold Digger | Kanye West | |
| 2005-11-12 | Gold Digger | Kanye West | |
| 2005-11-05 | Gold Digger | Kanye West | |
| 2005-10-29 | Gold Digger | Kanye West | |
| 2005-10-22 | Gold Digger | Kanye West | |
| 2005-10-15 | Gold Digger | Kanye West | |
| 2005-10-08 | Gold Digger | Kanye West | |
| 2005-10-01 | Gold Digger | Kanye West | |
| 2005-09-24 | Gold Digger | Kanye West | |
| 2005-09-17 | Gold Digger | Kanye West | |
| 2005-09-10 | We Belong Together | Mariah Carey | |
| 2005-09-03 | We Belong Together | Mariah Carey | |
| 2005-08-27 | We Belong Together | Mariah Carey | |
| 2005-08-20 | We Belong Together | Mariah Carey | |
| 2005-08-13 | We Belong Together | Mariah Carey | |
| 2005-08-06 | We Belong Together | Mariah Carey | |
| 2005-07-30 | We Belong Together | Mariah Carey | |
| 2005-07-23 | We Belong Together | Mariah Carey | |
| 2005-07-16 | We Belong Together | Mariah Carey | |
| 2005-07-09 | We Belong Together | Mariah Carey | |
| 2005-07-02 | Inside Your Heaven | Carrie Underwood | |
| 2005-06-25 | We Belong Together | Mariah Carey | |
| 2005-06-18 | We Belong Together | Mariah Carey | |
| 2005-06-11 | We Belong Together | Mariah Carey | |
| 2005-06-04 | We Belong Together | Mariah Carey | |
| 2005-05-28 | Hollaback Girl | Gwen Stefani | |
| 2005-05-21 | Hollaback Girl | Gwen Stefani | |
| 2005-05-14 | Hollaback Girl | Gwen Stefani | |
| 2005-05-07 | Hollaback Girl | Gwen Stefani | |
| 2005-04-30 | Candy Shop | 50 Cent | |
| 2005-04-23 | Candy Shop | 50 Cent | |
| 2005-04-16 | Candy Shop | 50 Cent | |
| 2005-04-09 | Candy Shop | 50 Cent | |
| 2005-04-02 | Candy Shop | 50 Cent | |
| 2005-03-26 | Candy Shop | 50 Cent | |
| 2005-03-19 | Candy Shop | 50 Cent | |
| 2005-03-12 | Candy Shop | 50 Cent | |
| 2005-03-05 | Candy Shop | 50 Cent | |
| 2005-02-26 | Let Me Love You | Mario | |
| 2005-02-19 | Let Me Love You | Mario | |
| 2005-02-12 | Let Me Love You | Mario | |
| 2005-02-05 | Let Me Love You | Mario | |
| 2005-01-29 | Let Me Love You | Mario | |
| 2005-01-22 | Let Me Love You | Mario | |
| 2005-01-15 | Let Me Love You | Mario | |
| 2005-01-08 | Let Me Love You | Mario | |
| 2005-01-01 | Let Me Love You | Mario |