# List of Billboard Mainstream Top 40 number-one songs of 2011

This is a list of songs which reached number one on the Billboard Mainstream Top 40 (or Pop Songs) chart in 2011.
During 2011, a total of 18 singles hit number-one on the charts.

## Chart history

Key :
| † | Indicates best-performing single of 2011 |
| Issue date | Song | Artist(s) |
| January 1 | "Raise Your Glass" | P!nk |
| January 8 | "Firework" | Katy Perry |
| January 15 | "Firework" | Katy Perry |
| January 22 | "Firework" | Katy Perry |
| January 29 | "Firework" | Katy Perry |
| February 5 | "Grenade" | Bruno Mars |
| February 12 | "Grenade" | Bruno Mars |
| February 19 | "Grenade" | Bruno Mars |
| February 26 | "Grenade" | Bruno Mars |
| March 5 | "Grenade" | Bruno Mars |
| March 12 | "Tonight (I'm Lovin' You)" | Enrique Iglesias featuring Ludacris & DJ Frank E |
| March 19 | "Tonight (I'm Lovin' You)" | Enrique Iglesias featuring Ludacris & DJ Frank E |
| March 26 | "Fuckin' Perfect" | P!nk |
| April 2 | "Fuckin' Perfect" | P!nk |
| April 9 | "Born This Way" | Lady Gaga |
| April 16 | "Fuck You (Forget You)" | Cee Lo Green |
| April 23 | "S&M" | Rihanna |
| April 30 | "E.T." | Katy Perry featuring Kanye West |
| May 7 | "E.T." | Katy Perry featuring Kanye West |
| May 14 | "E.T." | Katy Perry featuring Kanye West |
| May 21 | "E.T." | Katy Perry featuring Kanye West |
| May 28 | "E.T." | Katy Perry featuring Kanye West |
| June 4 | "E.T." | Katy Perry featuring Kanye West |
| June 11 | "Rolling in the Deep" | Adele |
| June 18 | "Rolling in the Deep" | Adele |
| June 25 | "Rolling in the Deep" | Adele |
| July 2 | "Rolling in the Deep" | Adele |
| July 9 | "Rolling in the Deep" | Adele |
| July 16 | "Give Me Everything" | Pitbull featuring Ne-Yo, Afrojack & Nayer |
| July 23 | "Give Me Everything" | Pitbull featuring Ne-Yo, Afrojack & Nayer |
| July 30 | "Give Me Everything" | Pitbull featuring Ne-Yo, Afrojack & Nayer |
| August 6 | "Party Rock Anthem" † | LMFAO featuring Lauren Bennett & GoonRock |
| August 13 | "Last Friday Night (T.G.I.F.)" | Katy Perry |
| August 20 | "Last Friday Night (T.G.I.F.)" | Katy Perry |
| August 27 | "Last Friday Night (T.G.I.F.)" | Katy Perry |
| September 3 | "Last Friday Night (T.G.I.F.)" | Katy Perry |
| September 10 | "Last Friday Night (T.G.I.F.)" | Katy Perry |
| September 17 | "Last Friday Night (T.G.I.F.)" | Katy Perry |
| September 24 | "I Wanna Go" | Britney Spears |
| October 1 | "Moves Like Jagger" | Maroon 5 featuring Christina Aguilera |
| October 8 | "Moves Like Jagger" | Maroon 5 featuring Christina Aguilera |
| October 15 | "Moves Like Jagger" | Maroon 5 featuring Christina Aguilera |
| October 22 | "Moves Like Jagger" | Maroon 5 featuring Christina Aguilera |
| October 29 | "Moves Like Jagger" | Maroon 5 featuring Christina Aguilera |
| November 5 | "Moves Like Jagger" | Maroon 5 featuring Christina Aguilera |
| November 12 | "Stereo Hearts" | Gym Class Heroes featuring Adam Levine |
| November 19 | "Stereo Hearts" | Gym Class Heroes featuring Adam Levine |
| November 26 | "Stereo Hearts" | Gym Class Heroes featuring Adam Levine |
| December 3 | "Without You" | David Guetta featuring Usher |
| December 10 | "We Found Love" | Rihanna featuring Calvin Harris |
| December 17 | "We Found Love" | Rihanna featuring Calvin Harris |
| December 24 | "We Found Love" | Rihanna featuring Calvin Harris |
| December 31 | "We Found Love" | Rihanna featuring Calvin Harris |