List of Ultratop 50 number-one singles of 2009
# List of Ultratop 50 number-one singles of 2009

These hits topped the Ultratop 50 in 2009.

| Date | Title | Artist |
| - | - | - |
| 3 January | "Home" | Tom Helsen & Geike Arnaert |
| 10 January | "Home" | Tom Helsen & Geike Arnaert |
| 17 January | "Home" | Tom Helsen & Geike Arnaert |
| 24 January | "Home" | Tom Helsen & Geike Arnaert |
| 31 January | "Use Somebody" | Kings of Leon |
| 7 February | "Use Somebody" | Kings of Leon |
| 14 February | "Mijn leven" | Andy Sierens A.K.A. Vijvenveertig featuring Hooverphonic |
| 21 February | "Poker Face" | Lady Gaga |
| 28 February | "Mijn leven" | Andy Sierens A.K.A. Vijvenveertig featuring Hooverphonic |
| 7 March | "Poker Face" | Lady Gaga |
| 14 March | "Poker Face" | Lady Gaga |
| 21 March | "Poker Face" | Lady Gaga |
| 28 March | "Poker Face" | Lady Gaga |
| 4 April | "Poker Face" | Lady Gaga |
| 11 April | "Poker Face" | Lady Gaga |
| 18 April | "Poker Face" | Lady Gaga |
| 25 April | "Poker Face" | Lady Gaga |
| 2 May | "Düm Tek Tek" | Hadise |
| 9 May | "Düm Tek Tek" | Hadise |
| 16 May | "Jungle Drum" | Emiliana Torrini |
| 23 May | "Düm Tek Tek" | Hadise |
| 30 May | "Fairytale" | Alexander Rybak |
| 6 June | "Fuck You" | Lily Allen |
| 13 June | "Fuck You" | Lily Allen |
| 20 June | "Fuck You" | Lily Allen |
| 27 June | "Boom Boom Pow" | The Black Eyed Peas |
| 4 July | "I Know You Want Me (Calle Ocho)" | Pitbull |
| 11 July | "I Know You Want Me (Calle Ocho)" | Pitbull |
| 18 July | "Blackout" | Milk Inc. |
| 25 July | "Blackout" | Milk Inc. |
| 1 August | "I Know You Want Me (Calle Ocho)" | Pitbull |
| 8 August | "I Gotta Feeling" | Black Eyed Peas |
| 15 August | "I Gotta Feeling" | Black Eyed Peas |
| 22 August | "I Gotta Feeling" | Black Eyed Peas |
| 29 August | "I Gotta Feeling" | Black Eyed Peas |
| 5 September | "I Gotta Feeling" | Black Eyed Peas |
| 12 September | "I Gotta Feeling" | Black Eyed Peas |
| 19 September | "I Gotta Feeling" | Black Eyed Peas |
| 26 September | "I Gotta Feeling" | Black Eyed Peas |
| 3 October | "Sexy Bitch" | David Guetta featuring Akon |
| 10 October | "Papillon" | Editors |
| 17 October | "MaMaSé!" | K3 |
| 24 October | "MaMaSé!" | K3 |
| 31 October | "MaMaSé!" | K3 |
| 7 November | "MaMaSé!" | K3 |
| 14 November | "MaMaSé!" | K3 |
| 21 November | "MaMaSé!" | K3 |
| 28 November | "MaMaSé!" | K3 |
| 5 December | "Meet Me Halfway" | Black Eyed Peas |
| 12 December | "Meet Me Halfway" | Black Eyed Peas |
| 19 December | "Meet Me Halfway" | Black Eyed Peas |
| 26 December | "Meet Me Halfway" | Black Eyed Peas |
