This is a list of songs that topped the Belgian Walloon (francophone) Ultratop 40 in 2009.[1]
| Issue date | Song title | Artist | |
|---|---|---|---|
| January 3 | "Toi + Moi" | ||
| January 10 | |||
| January 17 | |||
| January 24 | |||
| January 31 | "Hot n Cold" | Katy Perry | |
| February 7 | |||
| February 14 | "Poker Face" | Lady Gaga | |
| February 21 | |||
| February 28 | |||
| March 7 | |||
| March 14 | |||
| March 21 | |||
| March 28 | "Ici les Enfoirés" | Les Enfoirés | |
| April 4 | "Poker Face" | Lady Gaga | |
| April 11 | |||
| April 18 | |||
| April 25 | "Right Round" | Flo Rida featuring Ke$ha | |
| May 2 | "Broken Strings" | James Morrison featuring Nelly Furtado | |
| May 9 | "C'est dit" | Calogero | |
| May 16 | |||
| May 23 | |||
| May 30 | "Boom Boom Pow" | The Black Eyed Peas | |
| June 6 | |||
| June 13 | |||
| June 20 | |||
| June 27 | |||
| July 4 | "When Love Takes Over" | David Guetta featuring Kelly Rowland | |
| July 11 | |||
| July 18 | |||
| July 25 | |||
| August 1 | "I Gotta Feeling" | The Black Eyed Peas | |
| August 8 | |||
| August 15 | |||
| August 22 | |||
| August 29 | |||
| September 5 | "Sexy Bitch" | David Guetta featuring Akon | |
| September 12 | "I Gotta Feeling" | Black Eyed Peas | |
| September 19 | "Sexy Bitch" | David Guetta featuring Akon | |
| September 26 | "I Gotta Feeling" | Black Eyed Peas | |
| October 3 | "Alors on danse" | Stromae | |
| October 10 | |||
| October 17 | |||
| October 24 | |||
| October 31 | |||
| November 7 | "I Gotta Feeling" | Black Eyed Peas | |
| November 14 | "Sexy Bitch" | David Guetta featuring Akon | |
| November 21 | "Meet Me Halfway" | The Black Eyed Peas | |
| November 28 | |||
| December 5 | "We Are The Best" | The Champions | |
| December 12 | |||
| December 19 | |||
| December 26 | "Meet Me Halfway" | The Black Eyed Peas |