"Want U Back" is a song by British singer Cher Lloyd from her debut studio album, Sticks and Stones (2011). It was released as the third and final single from the album on 17 February 2012, and it was released as the lead single from the US version of the album on 22 May 2012. The UK single release features guest vocals from The X Factor US contestant Astro. In the United States the song was released as a solo single, without the Astro verses. Its remix features Snoop Dogg. The song was written by Savan Kotecha and Shellback, with production being handled by the latter. Musically, "Want U Back" is a dance-pop song, with elements of bubblegum and synthpop, while lyrically the song is about a girl who's jealous of her ex-boyfriend's new relationship, and tries to sabotage the new relationship.

The song received acclaim from most music critics, some praised her sassy attitude on the song and labelled it "infectious". There are two videos for the song: the UK version and the US version. The UK video features Lloyd traipsing through old photographs with her former beau and some with his new girlfriend and wreaking havoc on the happy couple, while the US version features Lloyd at a diner (Cadillac Jack's) wreaking havoc on her ex's new girlfriend. The song has reached number three on the New Zealand Singles Chart, number 18 on the Irish Singles Chart and number 25 on the UK Singles Chart. In the United States, the song has reached number nine on Billboard's Pop Songs chart, and number 12 on the Billboard Hot 100, making it her first top 40 hit in the United States. To date, it is Lloyd's biggest hit worldwide.

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