# List of Ultratop 50 number-one singles of 2015

These hits topped the Ultratop 50 in 2015.
Flanders :
| Issue date | Song | Artist |
| 3 January | "Are You With Me" | Lost Frequencies |
| 10 January | "Uptown Funk" | Mark Ronson featuring Bruno Mars |
| 17 January | "Uptown Funk" | Mark Ronson featuring Bruno Mars |
| 24 January | "Uptown Funk" | Mark Ronson featuring Bruno Mars |
| 31 January | "Christine" | Christine and the Queens |
| 7 February | "Christine" | Christine and the Queens |
| 14 February | "Christine" | Christine and the Queens |
| 21 February | "Christine" | Christine and the Queens |
| 28 February | "Cheerleader" (Felix Jaehn remix) | OMI |
| 7 March | "Cheerleader" (Felix Jaehn remix) | OMI |
| 14 March | "Cheerleader" (Felix Jaehn remix) | OMI |
| 21 March | "Cheerleader" (Felix Jaehn remix) | OMI |
| 28 March | "Christine" | Christine and the Queens |
| 4 April | "Cheerleader" (Felix Jaehn remix) | OMI |
| 11 April | "Goeiemorgend, Goeiendag" (Live) | Stan Van Samang |
| 18 April | "See You Again" | Wiz Khalifa featuring Charlie Puth |
| 25 April | "See You Again" | Wiz Khalifa featuring Charlie Puth |
| 2 May | "See You Again" | Wiz Khalifa featuring Charlie Puth |
| 9 May | "Een Ster (Live)" | Stan Van Samang |
| 16 May | "The Hum" | Dimitri Vegas & Like Mike Vs. Ummet Ozcan |
| 23 May | "Een Ster (Live)" | Stan Van Samang |
| 30 May | "Rhythm Inside" | Loïc Nottet |
| 6 June | "Rhythm Inside" | Loïc Nottet |
| 13 June | "Rhythm Inside" | Loïc Nottet |
| 20 June | "Rhythm Inside" | Loïc Nottet |
| 27 June | "Reality" | Lost Frequencies featuring Janieck Devy |
| 4 July | "Reality" | Lost Frequencies featuring Janieck Devy |
| 11 July | "Reality" | Lost Frequencies featuring Janieck Devy |
| 18 July | "Higher Place" | Dimitri Vegas & Like Mike feat. Ne-Yo |
| 25 July | "Reality" | Lost Frequencies featuring Janieck Devy |
| 1 August | "Higher Place" | Dimitri Vegas & Like Mike feat. Ne-Yo |
| 8 August | "Higher Place" | Dimitri Vegas & Like Mike feat. Ne-Yo |
| 15 August | "Higher Place" | Dimitri Vegas & Like Mike feat. Ne-Yo |
| 22 August | "Reality" | Lost Frequencies featuring Janieck Devy |
| 29 August | "Higher Place" | Dimitri Vegas & Like Mike feat. Ne-Yo |
| 5 September | "Higher Place" | Dimitri Vegas & Like Mike feat. Ne-Yo |
| 12 September | "Higher Place" | Dimitri Vegas & Like Mike feat. Ne-Yo |
| 19 September | "Higher Place" | Dimitri Vegas & Like Mike feat. Ne-Yo |
| 26 September | "Catch & Release" (Deepend remix) | Matt Simons |
| 3 October | "Catch & Release" (Deepend remix) | Matt Simons |
| 10 October | "Catch & Release" (Deepend remix) | Matt Simons |
| 17 October | "Catch & Release" (Deepend remix) | Matt Simons |
| 24 October | "Catch & Release" (Deepend remix) | Matt Simons |
| 31 October | "Hello" | Adele |
| 7 November | "Hello" | Adele |
| 14 November | "Hello" | Adele |
| 21 November | "10.000 luchtballonnen" | K3 |
| 28 November | "Hello" | Adele |
| 5 December | "Hello" | Adele |
| 12 December | "Hello" | Adele |
| 19 December | "Hello" | Adele |
| 26 December | "Hello" | Adele |
| Position | Artist | Weeks #1 |
| 1 | Dimitri Vegas & Like Mike | 9 |
| 2 | Adele | 8 |
| 2 | Ne-Yo | 8 |
| 3 | Lost Frequencies | 6 |
| 4 | Christine and the Queens | 5 |
| 4 | Janieck Devy | 5 |
| 4 | Matt Simons | 5 |
| 4 | Omi | 5 |
| 5 | Loïc Nottet | 4 |
| 6 | Mark Ronson | 3 |
| 6 | Bruno Mars | 3 |
| 6 | Wiz Khalifa | 3 |
| 6 | Charlie Puth | 3 |
| 6 | Stan Van Samang | 3 |
| 7 | K3 | 1 |
| 7 | Ummet Ozcan | 1 |
Wallonia :
| Issue date | Song | Artist |
| 3 January | "Dangerous" | David Guetta featuring Sam Martin |
| 10 January | "Uptown Funk" | Mark Ronson featuring Bruno Mars |
| 17 January | "Uptown Funk" | Mark Ronson featuring Bruno Mars |
| 24 January | "Uptown Funk" | Mark Ronson featuring Bruno Mars |
| 31 January | "Uptown Funk" | Mark Ronson featuring Bruno Mars |
| 7 February | "Uptown Funk" | Mark Ronson featuring Bruno Mars |
| 14 February | "Uptown Funk" | Mark Ronson featuring Bruno Mars |
| 21 February | "Christine" | Christine and the Queens |
| 28 February | "Christine" | Christine and the Queens |
| 7 March | "Christine" | Christine and the Queens |
| 14 March | "Christine" | Christine and the Queens |
| 21 March | "Christine" | Christine and the Queens |
| 28 March | "Cheerleader" (Felix Jaehn remix) | OMI |
| 4 April | "Cheerleader" (Felix Jaehn remix) | OMI |
| 11 April | "Cheerleader" (Felix Jaehn remix) | OMI |
| 18 April | "Cheerleader" (Felix Jaehn remix) | OMI |
| 25 April | "Cheerleader" (Felix Jaehn remix) | OMI |
| 2 May | "Cheerleader" (Felix Jaehn remix) | OMI |
| 9 May | "Cheerleader" (Felix Jaehn remix) | OMI |
| 16 May | "Easy Come Easy Go" | Alice on the roof |
| 23 May | "Goodbye" | Feder featuring Lyse |
| 30 May | "Rhythm Inside" | Loïc Nottet |
| 6 June | "Rhythm Inside" | Loïc Nottet |
| 13 June | "Goodbye" | Feder featuring Lyse |
| 20 June | "Goodbye" | Feder featuring Lyse |
| 27 June | "Homeless" | Marina Kaye |
| 4 July | "Homeless" | Marina Kaye |
| 11 July | "Goodbye" | Feder featuring Lyse |
| 18 July | "Reality" | Lost Frequencies featuring Janieck Devy |
| 25 July | "Reality" | Lost Frequencies featuring Janieck Devy |
| 1 August | "Reality" | Lost Frequencies featuring Janieck Devy |
| 8 August | "Reality" | Lost Frequencies featuring Janieck Devy |
| 15 August | "Reality" | Lost Frequencies featuring Janieck Devy |
| 22 August | "El Perdón" | Nicky Jam featuring Enrique Iglesias |
| 29 August | "El Perdón" | Nicky Jam featuring Enrique Iglesias |
| 5 September | "Stolen Car" | Mylène Farmer & Sting |
| 12 September | "El Perdón" | Nicky Jam feat. Enrique Iglesias |
| 19 September | "How Deep Is Your Love" | Calvin Harris & Disciples |
| 26 September | "How Deep Is Your Love" | Calvin Harris & Disciples |
| 3 October | "How Deep Is Your Love" | Calvin Harris & Disciples |
| 10 October | "How Deep Is Your Love" | Calvin Harris & Disciples |
| 17 October | "Catch & Release" | Matt Simons |
| 24 October | "Catch & Release" | Matt Simons |
| 31 October | "Hello" | Adele |
| 7 November | "Hello" | Adele |
| 14 November | "Hello" | Adele |
| 21 November | "Hello" | Adele |
| 28 November | "Hello" | Adele |
| 5 December | "Hello" | Adele |
| 12 December | "Hello" | Adele |
| 19 December | "Hello" | Adele |
| 26 December | "Hello" | Adele |
| Position | Artist | Weeks #1 |
| 1 | Adele | 9 |
| 2 | OMI | 7 |
| 3 | Mark Ronson | 6 |
| 3 | Bruno Mars | 6 |
| 4 | Christine and the Queens | 5 |
| 4 | Lost Frequencies | 5 |
| 4 | Janieck Devy | 5 |
| 5 | Calvin Harris | 4 |
| 5 | Disciples | 4 |
| 5 | Feder | 4 |
| 5 | Lyse | 4 |
| 6 | Nicky Jam | 3 |
| 6 | Enrique Iglesias | 3 |
| 7 | Loïc Nottet | 2 |
| 7 | Marina Kaye | 2 |
| 7 | Matt Simons | 2 |
| 8 | David Guetta | 1 |
| 8 | Sam Martin | 1 |
| 8 | Alice on the roof | 1 |
| 8 | Mylène Farmer | 1 |
| 8 | Sting | 1 |