"Shake It Off" is a song recorded by American singer-songwriter Taylor Swift from her fifth album, 1989 (2014). Written by Swift, Max Martin and Shellback, it is an uptempo dance-pop track considered to be a departure from Swift's earlier country pop music style. "Shake It Off" is the sixth track on the album and serves as the lead single. The song premiered during a Yahoo! live stream session on August 18, 2014 (also streaming internationally online); its music video was also released the same day. Several hours later, the song was made available for digital download.

"Shake It Off" debuted at number one on the Billboard Hot 100 chart for the week ending September 6, 2014, becoming Swift's second number-one single in the United States and the 22nd song to debut at number one in the chart's history. The song won Favorite Song at the 2015 People's Choice Awards, and also received nominations for Record of the Year, Song of the Year and Best Pop Solo Performance at the 2015 Grammy Awards.

According to Billboard, it is Swift's biggest Hot 100 hit, staying on the chart for 50 consecutive weeks.

Swift began teasing about an announcement in August 2014. On August 4, she posted a video on Instagram in which she pushes the number 18 in an elevator. On August 6, she tweeted an image of the time 5:00 and the next day a screenshot from a Yahoo! homepage. She later confirmed on August 13, 2014 on The Tonight Show Starring Jimmy Fallon that a Yahoo! live stream session would take place on August 18, 2014 at 5pm. During the live stream, Swift announced her upcoming fifth album and premiered its lead single.

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