# List of Billboard Hot 100 number ones of 2015

The Billboard Hot 100 is a chart that ranks the best-performing singles of the United States. Its data, compiled by Nielsen SoundScan and published by Billboard magazine, is based collectively on each single's weekly physical and digital sales, as well as airplay and streaming.
During 2015, eight singles reached number one on the Hot 100; a ninth single, "Blank Space" by Taylor Swift, began its run at number one in November 2014. Of those nine number-one singles, three were collaborations. In total, ten acts topped the chart as either lead or featured artists, with six—Mark Ronson, Charlie Puth, Kendrick Lamar, Omi, The Weeknd and Justin Bieber—achieving their first Hot 100 number-one single. Mark Ronson and Bruno Mars' "Uptown Funk" was the longest-running number-one of the year, leading the chart for fourteen weeks; it subsequently topped the Billboard Year-End Hot 100.

## Chart history

Key :
| † | Indicates best-performing single of 2015 |
| No. | Issue date | Song | Artist(s) |
| 1040 | January 3 | "Blank Space" | Taylor Swift |
| 1040 | January 10 | "Blank Space" | Taylor Swift |
| 1041 | January 17 | "Uptown Funk" † | Mark Ronson featuring Bruno Mars |
| 1041 | January 24 | "Uptown Funk" † | Mark Ronson featuring Bruno Mars |
| 1041 | January 31 | "Uptown Funk" † | Mark Ronson featuring Bruno Mars |
| 1041 | February 7 | "Uptown Funk" † | Mark Ronson featuring Bruno Mars |
| 1041 | February 14 | "Uptown Funk" † | Mark Ronson featuring Bruno Mars |
| 1041 | February 21 | "Uptown Funk" † | Mark Ronson featuring Bruno Mars |
| 1041 | February 28 | "Uptown Funk" † | Mark Ronson featuring Bruno Mars |
| 1041 | March 7 | "Uptown Funk" † | Mark Ronson featuring Bruno Mars |
| 1041 | March 14 | "Uptown Funk" † | Mark Ronson featuring Bruno Mars |
| 1041 | March 21 | "Uptown Funk" † | Mark Ronson featuring Bruno Mars |
| 1041 | March 28 | "Uptown Funk" † | Mark Ronson featuring Bruno Mars |
| 1041 | April 4 | "Uptown Funk" † | Mark Ronson featuring Bruno Mars |
| 1041 | April 11 | "Uptown Funk" † | Mark Ronson featuring Bruno Mars |
| 1041 | April 18 | "Uptown Funk" † | Mark Ronson featuring Bruno Mars |
| 1042 | April 25 | "See You Again" | Wiz Khalifa featuring Charlie Puth |
| 1042 | May 2 | "See You Again" | Wiz Khalifa featuring Charlie Puth |
| 1042 | May 9 | "See You Again" | Wiz Khalifa featuring Charlie Puth |
| 1042 | May 16 | "See You Again" | Wiz Khalifa featuring Charlie Puth |
| 1042 | May 23 | "See You Again" | Wiz Khalifa featuring Charlie Puth |
| 1042 | May 30 | "See You Again" | Wiz Khalifa featuring Charlie Puth |
| 1043 | June 6 | "Bad Blood" | Taylor Swift featuring Kendrick Lamar |
| re | June 13 | "See You Again" | Wiz Khalifa featuring Charlie Puth |
| re | June 20 | "See You Again" | Wiz Khalifa featuring Charlie Puth |
| re | June 27 | "See You Again" | Wiz Khalifa featuring Charlie Puth |
| re | July 4 | "See You Again" | Wiz Khalifa featuring Charlie Puth |
| re | July 11 | "See You Again" | Wiz Khalifa featuring Charlie Puth |
| re | July 18 | "See You Again" | Wiz Khalifa featuring Charlie Puth |
| 1044 | July 25 | "Cheerleader" | Omi |
| 1044 | August 1 | "Cheerleader" | Omi |
| 1044 | August 8 | "Cheerleader" | Omi |
| 1044 | August 15 | "Cheerleader" | Omi |
| 1045 | August 22 | "Can't Feel My Face" | The Weeknd |
| re | August 29 | "Cheerleader" | Omi |
| re | September 5 | "Cheerleader" | Omi |
| re | September 12 | "Can't Feel My Face" | The Weeknd |
| 1046 | September 19 | "What Do You Mean?" | Justin Bieber |
| re | September 26 | "Can't Feel My Face" | The Weeknd |
| 1047 | October 3 | "The Hills" | The Weeknd |
| 1047 | October 10 | "The Hills" | The Weeknd |
| 1047 | October 17 | "The Hills" | The Weeknd |
| 1047 | October 24 | "The Hills" | The Weeknd |
| 1047 | October 31 | "The Hills" | The Weeknd |
| 1047 | November 7 | "The Hills" | The Weeknd |
| 1048 | November 14 | "Hello" | Adele |
| 1048 | November 21 | "Hello" | Adele |
| 1048 | November 28 | "Hello" | Adele |
| 1048 | December 5 | "Hello" | Adele |
| 1048 | December 12 | "Hello" | Adele |
| 1048 | December 19 | "Hello" | Adele |
| 1048 | December 26 | "Hello" | Adele |

## Number-one artists

List of number-one artists by total weeks at number one :
| Position | Artist | Weeks at No. 1 |
| 1 | Mark Ronson | 14 |
| 1 | Bruno Mars | 14 |
| 3 | Wiz Khalifa | 12 |
| 3 | Charlie Puth | 12 |
| 5 | The Weeknd | 9 |
| 6 | Adele | 7 |
| 7 | Omi | 6 |
| 8 | Taylor Swift | 3 |
| 9 | Kendrick Lamar | 1 |
| 9 | Justin Bieber | 1 |