"Fancy" is a song by Australian rapper Iggy Azalea featuring British recording artist Charli XCX, taken from the former's debut studio album, The New Classic (2014). It was released on 17 February 2014 by Def Jam Recordings as the fourth single from the album. "Fancy" was described as an electro-hop song; it was written by Azalea and XCX and composed by production team the Invisible Men, who also produced it, alongside The Arcade. It was leaked under the title "Leave It" in December 2013.

"Fancy" reached number one on the Billboard Hot 100, becoming both Azalea's and XCX's first number-one on that chart, holding the spot for seven consecutive weeks. It also topped the charts in Canada and New Zealand and had chart success around the world, including reaching the top ten in several countries such as Azalea's native Australia and United Kingdom, where it became her first top five single in both countries as a lead artist. It is XCX's second top-ten single after her guest spot on Icona Pop's "I Love It" in 2013. The track was named Billboard's Song of the Summer for 2014, as well as the most-streamed song on Spotify and most-watched music video on Vevo in 2014. It won the Top Rap Song category at the 2015 Billboard Music Awards and was nominated for Record of the Year and Best Pop Duo/Group Performance at the 57th Grammy Awards. It is one of the best-selling singles worldwide, with combined sales and track-equivalent streams of 9.1 million units according to IFPI.

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