“Circus” is a song recorded by Britney Spears for her sixth studio album of the same name. It was released on 2nd December 2008 as the second single of the album.

In the track Britney compares her life to the chaos and grandiose of a traditional circus.

It was very well received by contemporary critics, with reviewers complimenting Spears' confident persona, while praising its electronic production.

“Circus” was a commercial success, peaking inside the top-ten in Australia, Canada, Denmark, New Zealand, and Sweden, while reaching top-twenty positions in many European countries.