# List of Ultratop 50 number-one singles of 2017

These hits topped the Ultratop 50 in 2017.
Flanders :
| Issue date | Song | Artist |
| 7 January | "24K Magic" | Bruno Mars |
| 14 January | "Hey Baby" | Dimitri Vegas & Like Mike vs. Diplo featuring Deb's Daughter |
| 21 January | "Shape of You" | Ed Sheeran |
| 28 January | "Shape of You" | Ed Sheeran |
| 4 February | "Shape of You" | Ed Sheeran |
| 11 February | "Shape of You" | Ed Sheeran |
| 18 February | "Shape of You" | Ed Sheeran |
| 25 February | "Shape of You" | Ed Sheeran |
| 4 March | "Shape of You" | Ed Sheeran |
| 11 March | "Shape of You" | Ed Sheeran |
| 18 March | "Shape of You" | Ed Sheeran |
| 25 March | "Shape of You" | Ed Sheeran |
| 1 April | "Shape of You" | Ed Sheeran |
| 8 April | "Shape of You" | Ed Sheeran |
| 15 April | "Shape of You" | Ed Sheeran |
| 22 April | "Shape of You" | Ed Sheeran |
| 29 April | "Something Just Like This" | The Chainsmokers featuring Coldplay |
| 6 May | "Shape of You" | Ed Sheeran |
| 13 May | "Something Just Like This" | The Chainsmokers featuring Coldplay |
| 20 May | "City Lights" | Blanche |
| 27 May | "City Lights" | Blanche |
| 3 June | "Despacito" | Luis Fonsi featuring Daddy Yankee |
| 10 June | "Despacito" | Luis Fonsi featuring Daddy Yankee |
| 17 June | "Despacito" | Luis Fonsi featuring Daddy Yankee |
| 24 June | "Despacito" | Luis Fonsi featuring Daddy Yankee |
| 1 July | "Despacito" | Luis Fonsi featuring Daddy Yankee |
| 8 July | "Despacito" | Luis Fonsi featuring Daddy Yankee |
| 15 July | "Despacito" | Luis Fonsi featuring Daddy Yankee |
| 22 July | "Despacito" | Luis Fonsi featuring Daddy Yankee |
| 29 July | "Despacito" | Luis Fonsi featuring Daddy Yankee |
| 5 August | "Despacito" | Luis Fonsi featuring Daddy Yankee |
| 12 August | "Despacito" | Luis Fonsi featuring Daddy Yankee |
| 19 August | "Despacito" | Luis Fonsi featuring Daddy Yankee |
| 26 August | "Where Did You Go (Summer Love)" | Regi |
| 2 September | "Where Did You Go (Summer Love)" | Regi |
| 9 September | "Where Did You Go (Summer Love)" | Regi |
| 16 September | "Where Did You Go (Summer Love)" | Regi |
| 23 September | "New Rules" | Dua Lipa |
| 30 September | "New Rules" | Dua Lipa |
| 7 October | "Perfect" | Ed Sheeran |
| 14 October | "New Rules" | Dua Lipa |
| 21 October | "New Rules" | Dua Lipa |
| 28 October | "New Rules" | Dua Lipa |
| 4 November | "Perfect" (including "Perfect Duet" and "Perfect Symphony") | Ed Sheeran (with Beyoncé / with Andrea Bocelli) |
| 11 November | "Perfect" (including "Perfect Duet" and "Perfect Symphony") | Ed Sheeran (with Beyoncé / with Andrea Bocelli) |
| 18 November | "Perfect" (including "Perfect Duet" and "Perfect Symphony") | Ed Sheeran (with Beyoncé / with Andrea Bocelli) |
| 25 November | "Perfect" (including "Perfect Duet" and "Perfect Symphony") | Ed Sheeran (with Beyoncé / with Andrea Bocelli) |
| 2 December | "Perfect" (including "Perfect Duet" and "Perfect Symphony") | Ed Sheeran (with Beyoncé / with Andrea Bocelli) |
| 9 December | "Perfect" (including "Perfect Duet" and "Perfect Symphony") | Ed Sheeran (with Beyoncé / with Andrea Bocelli) |
| 16 December | "Perfect" (including "Perfect Duet" and "Perfect Symphony") | Ed Sheeran (with Beyoncé / with Andrea Bocelli) |
| 23 December | "Perfect" (including "Perfect Duet" and "Perfect Symphony") | Ed Sheeran (with Beyoncé / with Andrea Bocelli) |
| 30 December | "Perfect" (including "Perfect Duet" and "Perfect Symphony") | Ed Sheeran (with Beyoncé / with Andrea Bocelli) |
Wallonia :
| Issue date | Song | Artist |
| 7 January | "Human" | Rag'n'Bone Man |
| 14 January | "Rockabye" | Clean Bandit featuring Sean Paul and Anne-Marie |
| 21 January | "Rockabye" | Clean Bandit featuring Sean Paul and Anne-Marie |
| 28 January | "Rockabye" | Clean Bandit featuring Sean Paul and Anne-Marie |
| 4 February | "Shape of You" | Ed Sheeran |
| 11 February | "Shape of You" | Ed Sheeran |
| 18 February | "Shape of You" | Ed Sheeran |
| 25 February | "Shape of You" | Ed Sheeran |
| 4 March | "Shape of You" | Ed Sheeran |
| 11 March | "Shape of You" | Ed Sheeran |
| 18 March | "Shape of You" | Ed Sheeran |
| 25 March | "Shape of You" | Ed Sheeran |
| 1 April | "Shape of You" | Ed Sheeran |
| 8 April | "Shape of You" | Ed Sheeran |
| 15 April | "Shape of You" | Ed Sheeran |
| 22 April | "Shape of You" | Ed Sheeran |
| 29 April | "Shape of You" | Ed Sheeran |
| 6 May | "Shape of You" | Ed Sheeran |
| 13 May | "Shape of You" | Ed Sheeran |
| 20 May | "Despacito" | Luis Fonsi featuring Daddy Yankee |
| 27 May | "Despacito" | Luis Fonsi featuring Daddy Yankee |
| 3 June | "Despacito" | Luis Fonsi featuring Daddy Yankee |
| 10 June | "Despacito" | Luis Fonsi featuring Daddy Yankee |
| 17 June | "Despacito" | Luis Fonsi featuring Daddy Yankee |
| 24 June | "Despacito" | Luis Fonsi featuring Daddy Yankee |
| 1 July | "Despacito" | Luis Fonsi featuring Daddy Yankee |
| 8 July | "Despacito" | Luis Fonsi featuring Daddy Yankee |
| 15 July | "Despacito" | Luis Fonsi featuring Daddy Yankee |
| 22 July | "Despacito" | Luis Fonsi featuring Daddy Yankee |
| 29 July | "Despacito" | Luis Fonsi featuring Daddy Yankee |
| 5 August | "Despacito" | Luis Fonsi featuring Daddy Yankee |
| 12 August | "Despacito" | Luis Fonsi featuring Daddy Yankee |
| 19 August | "Despacito" | Luis Fonsi featuring Daddy Yankee |
| 26 August | "Despacito" | Luis Fonsi featuring Daddy Yankee |
| 2 September | "Feels" | Calvin Harris featuring Pharrell Williams, Katy Perry and Big Sean |
| 9 September | "Feels" | Calvin Harris featuring Pharrell Williams, Katy Perry and Big Sean |
| 16 September | "Feels" | Calvin Harris featuring Pharrell Williams, Katy Perry and Big Sean |
| 23 September | "Feels" | Calvin Harris featuring Pharrell Williams, Katy Perry and Big Sean |
| 30 September | "Feels" | Calvin Harris featuring Pharrell Williams, Katy Perry and Big Sean |
| 7 October | "Réseaux" | Niska |
| 14 October | "Réseaux" | Niska |
| 21 October | "Réseaux" | Niska |
| 28 October | "Mwaka Moon" | Kalash featuring Damso |
| 4 November | "Mwaka Moon" | Kalash featuring Damso |
| 11 November | "Mwaka Moon" | Kalash featuring Damso |
| 18 November | "Perfect" (including "Perfect Duet" and "Perfect Symphony") | Ed Sheeran (with Beyoncé / with Andrea Bocelli) |
| 25 November | "Perfect" (including "Perfect Duet" and "Perfect Symphony") | Ed Sheeran (with Beyoncé / with Andrea Bocelli) |
| 2 December | "Perfect" (including "Perfect Duet" and "Perfect Symphony") | Ed Sheeran (with Beyoncé / with Andrea Bocelli) |
| 9 December | "Perfect" (including "Perfect Duet" and "Perfect Symphony") | Ed Sheeran (with Beyoncé / with Andrea Bocelli) |
| 16 December | "Perfect" (including "Perfect Duet" and "Perfect Symphony") | Ed Sheeran (with Beyoncé / with Andrea Bocelli) |
| 23 December | "Perfect" (including "Perfect Duet" and "Perfect Symphony") | Ed Sheeran (with Beyoncé / with Andrea Bocelli) |
| 30 December | "Perfect" (including "Perfect Duet" and "Perfect Symphony") | Ed Sheeran (with Beyoncé / with Andrea Bocelli) |
Flanders Ranking of most weeks at number 1 :
| Position | Artist | Weeks #1 |
Wallonia Ranking of most weeks at number 1 :
| Position | Artist | Weeks #1 |