| Date | Artist - Title | Weeks at #1 |
|---|---|---|
2009 Number One Songs | ||
| – | Alexandra Burke - Hallelujah | 3 |
| – | Lady Gaga feat. Colby O'Donis - Just Dance | 3 |
| – | Lily Allen - The Fear | 4 |
| – | Kelly Clarkson - My Life Would Suck Without You | 1 |
| – | Flo Rida - Right Round | 1 |
| – | Ruth Jones and Rob Brydon feat. Tom Jones and Robin Gibb - Islands In The Stream | 1 |
| – | Lady Gaga - Poker Face | 3 |
| – | Calvin Harris - I'm Not Alone | 2 |
| – | Tinchy Stryder feat. N-Dubz - Number 1 | 3 |
| – | Black Eyed Peas - Boom Boom Pow | 2 (1) |
| – | Dizzee Rascal - Bonkers | 2 |
| – | Black Eyed Peas - Boom Boom Pow | 2 (1) |
| – | Pixie Lott - Mama Do (Uh Oh, Uh Oh) | 1 |
| – | David Guetta feat. Kelly Rowland - When Love Takes Over | 1 |
| – | La Roux - Bulletproof | 1 |
| – | Cascada - Evacuate the Dancefloor | 2 |
| – | JLS - Beat Again | 2 |
| – | Black Eyed Peas - I Gotta Feeling | 2 (1) |
| – | Tinchy Stryder feat. Amelle Berrabah - Never Leave You | 1 |
| – | Black Eyed Peas - I Gotta Feeling | 2 (1) |
| – | David Guetta feat. Akon - Sexy Bitch | 1 |
| – | Dizzee Rascal feat. Chrome - Holiday | 1 |
| – | Jay Z feat. Rihanna and Kanye West - Run This Town | 1 |
| – | Pixie Lott - Boys and Girls | 1 |
| – | Taio Cruz - Break Your Heart | 3 |
| – | Chipmunk - Oopsy Daisy | 1 |
| – | Alexandra Burke feat Flo Rida - Bad Boys | 1 |
| – | Cheryl Cole - Fight For This Love | 2 |
| – | JLS - Everybody In Love | 1 |
| – | Black Eyed Peas - Meet Me Halfway | 1 |
| – | The X Factor Finalists - You Are Not Alone | 1 |
| – | Peter Kay's Animated All Star Band - The Official BBC Children in Need Medley | 2 |
| – | Lady Gaga - Bad Romance | 2 (1) |
| – | Rage Against the Machine - Killing In The Name | 1 |
| – | Joe McElderry - The Climb | 1 |
33 different songs hit number one in the UK during 2009.
