"Shake It Off" is a song performed by American singer and songwriter Mariah Carey, taken from her tenth studio album, The Emancipation of Mimi (2005). It was written and produced by Carey along with Jermaine Dupri, Bryan-Michael Cox, and Johntá Austin. The song was initially solicited to radio on July 12, 2005 by Island and Mercury Records as the album's third single in the United States, while "Get Your Number" served as the album's third single elsewhere. Described by Dupri as "ghetto," the track is a R&B song that makes use of pop and hip hop influences and a simple, sparse production. Lyrically, the song follows Carey as she moves on from her relationship with an unfaithful lover, packing her things and breaking up with him over an answering machine.

The song was well received by music critics, with many complimenting its simple yet inspirational lyrics, as well as calling it a standout track from the album. It peaked at number two on the US Billboard Hot 100, blocked by Carey's own "We Belong Together" and Kanye West's "Gold Digger" for six weeks. Furthermore, it marked the first time a female lead artist occupied the top two positions of the Hot 100. The song also peaked at numbers six and five in Australia and New Zealand, and numbers fifteen and nine in Ireland and the United Kingdom, respectively.

The song's music video, directed by Jake Nava features numerous extravagant wardrobe changes and starred actor Chris Tucker. The video was nominated for Best R&B Video at the 2005 MTV Video Music Awards. "Shake It Off" was performed live by Carey on several televised events, including the 2005 MTV Video Music Awards, the 2005 World Music Awards and British program Top of the Pops. Additionally it was performed as a five-piece concert on Good Morning America, and on the New Year's Eve special titled, Dick Clark's New Year's Rockin' Eve with Ryan Seacrest. "Shake It Off" was included on the set-lists of The Adventures of Mimi Tour (2006), the Angels Advocate Tour (2010), and The Elusive Chanteuse Show (2014).

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