"Happy" is a song performed by British singer Leona Lewis for her second studio album Echo (2009). It was written by Lewis, Ryan Tedder, Evan Bogart, and produced by Tedder, and it was premiered in the United Kingdom radio on 6 September 2009, and officially released on 15 September 2009, by digital download in the United States, serving as the album's lead single. Lyrically, it talks about a protagonist, that wants to be happy and seize the day.

It received generally positive reviews from music critics, praising the production and, some of them, calling it a "number one song". The single was promoted in the television programmes America's Got Talent, The X Factor, among others, and on the VH1 Divas concert in 2009. The music video was filmed in Cuba, and describes a woman who is in love with her friend. The song debuted at number 50 on the Billboard Hot 100 selling nearly 52,000 copies in the US, while in the UK, "Happy", debuted and peaked at number two, being blocked from the top spot by the song "Meet Me Halfway" by The Black Eyed Peas. Moreover, the single reached the top ten in Austria, Germany, Ireland, Japan and Switzerland.

"Happy" was written by Lewis, Ryan Tedder and Evan Bogart, and produced by Tedder for Lewis's second album Echo. The song, which is four minutes and two seconds in length, was recorded immediately after it was written. Lewis commented, "The vocal was totally spontaneous. I sang it as soon as we finished writing. Sometimes it's better not to over-think things." In a message on MySpace, Tedder wrote:

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