# List of Ultratop 50 number-one singles of 2018

These hits topped the Ultratop 50 in 2018.
Flanders :
| Issue date | Song | Artist |
| 6 January | "Perfect" (including "Perfect Duet" and "Perfect Symphony") | Ed Sheeran (with Beyoncé / with Andrea Bocelli) |
| 13 January | "Perfect" (including "Perfect Duet" and "Perfect Symphony") | Ed Sheeran (with Beyoncé / with Andrea Bocelli) |
| 20 January | "Perfect" (including "Perfect Duet" and "Perfect Symphony") | Ed Sheeran (with Beyoncé / with Andrea Bocelli) |
| 27 January | "Perfect" (including "Perfect Duet" and "Perfect Symphony") | Ed Sheeran (with Beyoncé / with Andrea Bocelli) |
| 3 February | "Perfect" (including "Perfect Duet" and "Perfect Symphony") | Ed Sheeran (with Beyoncé / with Andrea Bocelli) |
| 10 February | "Crazy" | Lost Frequencies and Zonderling |
| 17 February | "Crazy" | Lost Frequencies and Zonderling |
| 24 February | "Crazy" | Lost Frequencies and Zonderling |
| 3 March | "Crazy" | Lost Frequencies and Zonderling |
| 10 March | "Crazy" | Lost Frequencies and Zonderling |
| 17 March | "Zoutelande" | BLØF featuring Geike Arnaert |
| 24 March | "Zoutelande" | BLØF featuring Geike Arnaert |
| 31 March | "Zoutelande" | BLØF featuring Geike Arnaert |
| 7 April | "Zoutelande" | BLØF featuring Geike Arnaert |
| 14 April | "Zoutelande" | BLØF featuring Geike Arnaert |
| 21 April | "Zoutelande" | BLØF featuring Geike Arnaert |
| 28 April | "One Kiss" | Calvin Harris and Dua Lipa |
| 5 May | "One Kiss" | Calvin Harris and Dua Lipa |
| 12 May | "One Kiss" | Calvin Harris and Dua Lipa |
| 19 May | "One Kiss" | Calvin Harris and Dua Lipa |
| 26 May | "One Kiss" | Calvin Harris and Dua Lipa |
| 2 June | "One Kiss" | Calvin Harris and Dua Lipa |
| 9 June | "One Kiss" | Calvin Harris and Dua Lipa |
| 16 June | "One Kiss" | Calvin Harris and Dua Lipa |
| 23 June | "One Kiss" | Calvin Harris and Dua Lipa |
| 30 June | "One Kiss" | Calvin Harris and Dua Lipa |
| 7 July | "One Kiss" | Calvin Harris and Dua Lipa |
| 14 July | "One Kiss" | Calvin Harris and Dua Lipa |
| 21 July | "One Kiss" | Calvin Harris and Dua Lipa |
| 28 July | "Ellie" | Regi featuring Jake Reese |
| 4 August | "Ellie" | Regi featuring Jake Reese |
| 11 August | "Ellie" | Regi featuring Jake Reese |
| 18 August | "Ellie" | Regi featuring Jake Reese |
| 25 August | "Ellie" | Regi featuring Jake Reese |
| 1 September | "Ellie" | Regi featuring Jake Reese |
| 8 September | "Ellie" | Regi featuring Jake Reese |
| 15 September | "Shotgun" | George Ezra |
| 22 September | "Shotgun" | George Ezra |
| 29 September | "Shotgun" | George Ezra |
| 6 October | "Shotgun" | George Ezra |
| 13 October | "Shotgun" | George Ezra |
| 20 October | "Shotgun" | George Ezra |
| 27 October | "Shotgun" | George Ezra |
| 3 November | "Be Alright" | Dean Lewis |
| 10 November | "Shotgun" | George Ezra |
| 17 November | "Promises" | Calvin Harris and Sam Smith |
| 24 November | "Be Alright" | Dean Lewis |
| 1 December | "Sweet but Psycho" | Ava Max |
| 8 December | "Sweet but Psycho" | Ava Max |
| 15 December | "Sweet but Psycho" | Ava Max |
| 22 December | "Sweet but Psycho" | Ava Max |
| 29 December | "Sweet but Psycho" | Ava Max |
Wallonia :
| Issue date | Song | Artist |
| 6 January | "Perfect" (including "Perfect Duet" and "Perfect Symphony") | Ed Sheeran (with Beyoncé / with Andrea Bocelli) |
| 13 January | "Perfect" (including "Perfect Duet" and "Perfect Symphony") | Ed Sheeran (with Beyoncé / with Andrea Bocelli) |
| 20 January | "Perfect" (including "Perfect Duet" and "Perfect Symphony") | Ed Sheeran (with Beyoncé / with Andrea Bocelli) |
| 27 January | "Perfect" (including "Perfect Duet" and "Perfect Symphony") | Ed Sheeran (with Beyoncé / with Andrea Bocelli) |
| 3 February | "Perfect" (including "Perfect Duet" and "Perfect Symphony") | Ed Sheeran (with Beyoncé / with Andrea Bocelli) |
| 10 February | "Perfect" (including "Perfect Duet" and "Perfect Symphony") | Ed Sheeran (with Beyoncé / with Andrea Bocelli) |
| 17 February | "Hit Sale" | Therapie Taxi featuring Roméo Elvis |
| 24 February | "Hit Sale" | Therapie Taxi featuring Roméo Elvis |
| 3 March | "Hit Sale" | Therapie Taxi featuring Roméo Elvis |
| 10 March | "Crazy" | Lost Frequencies and Zonderling |
| 17 March | "Hit Sale" | Therapie Taxi featuring Roméo Elvis |
| 24 March | "Hit Sale" | Therapie Taxi featuring Roméo Elvis |
| 31 March | "Crazy" | Lost Frequencies and Zonderling |
| 7 April | "La même" | Maître Gims featuring Vianney |
| 14 April | "La même" | Maître Gims featuring Vianney |
| 21 April | "La même" | Maître Gims featuring Vianney |
| 28 April | "La même" | Maître Gims featuring Vianney |
| 5 May | "La même" | Maître Gims featuring Vianney |
| 12 May | "La même" | Maître Gims featuring Vianney |
| 19 May | "La même" | Maître Gims featuring Vianney |
| 26 May | "La même" | Maître Gims featuring Vianney |
| 2 June | "La même" | Maître Gims featuring Vianney |
| 9 June | "La même" | Maître Gims featuring Vianney |
| 16 June | "La même" | Maître Gims featuring Vianney |
| 23 June | "Smog" | Damso |
| 30 June | "One Kiss" | Calvin Harris and Dua Lipa |
| 7 July | "One Kiss" | Calvin Harris and Dua Lipa |
| 14 July | "One Kiss" | Calvin Harris and Dua Lipa |
| 21 July | "One Kiss" | Calvin Harris and Dua Lipa |
| 28 July | "One Kiss" | Calvin Harris and Dua Lipa |
| 4 August | "One Kiss" | Calvin Harris and Dua Lipa |
| 11 August | "One Kiss" | Calvin Harris and Dua Lipa |
| 18 August | "One Kiss" | Calvin Harris and Dua Lipa |
| 25 August | "One Kiss" | Calvin Harris and Dua Lipa |
| 1 September | "Solo" | Clean Bandit featuring Demi Lovato |
| 8 September | "Solo" | Clean Bandit featuring Demi Lovato |
| 15 September | "Solo" | Clean Bandit featuring Demi Lovato |
| 22 September | "Solo" | Clean Bandit featuring Demi Lovato |
| 29 September | "In My Mind" | Dynoro and Gigi D'Agostino |
| 6 October | "In My Mind" | Dynoro and Gigi D'Agostino |
| 13 October | "In My Mind" | Dynoro and Gigi D'Agostino |
| 20 October | "In My Mind" | Dynoro and Gigi D'Agostino |
| 27 October | "In My Mind" | Dynoro and Gigi D'Agostino |
| 3 November | "In My Mind" | Dynoro and Gigi D'Agostino |
| 10 November | "In My Mind" | Dynoro and Gigi D'Agostino |
| 17 November | "In My Mind" | Dynoro and Gigi D'Agostino |
| 24 November | "Rêves bizarres" | Orelsan featuring Damso |
| 1 December | "In My Mind" | Dynoro and Gigi D'Agostino |
| 8 December | "In My Mind" | Dynoro and Gigi D'Agostino |
| 15 December | "In My Mind" | Dynoro and Gigi D'Agostino |
| 22 December | "Tout oublier" | Angèle featuring Roméo Elvis |
| 29 December | "Tout oublier" | Angèle featuring Roméo Elvis |
Flanders Ranking of most weeks at number 1 :
| Position | Artist | Weeks #1 |
Wallonia Ranking of most weeks at number 1 :
| Position | Artist | Weeks #1 |