"Look What You Made Me Do" is a song recorded by American singer-songwriter Taylor Swift from her upcoming sixth studio album, Reputation (2017). The song was released on August 25, 2017, as the lead single from the album. Swift wrote the song with Jack Antonoff. The song samples the melody of the 1991 song "I'm Too Sexy" by the band Right Said Fred, therefore Fred Fairbrass, Richard Fairbrass, and Rob Manzoli of the band are credited as songwriters.

The song received a mixed response from music critics, with division over Swift's stylistic change. The music video was directed by Joseph Kahn and became the most-watched music video within 24 hours. The song broke a string of records, including the record for the most plays in a single day on Spotify. It has topped the charts in 18 countries and reached the top 10 in 21 other countries. It has received Platinum certifications in the United States, Australia, and Canada.

On August 18, 2017, Swift cleared all her social media accounts, which sparked rumours of new music arriving soon. On August 21, Swift shared a 10-second video featuring the tail of a snake on all her social platforms; a second part appeared the next day and on August 23, she uploaded a third teaser, showing the snake's head. On the same day, Swift announced that the first single of her upcoming sixth album, titled Reputation, would come out the following night. The song was released to streaming services on August 24, and earned over eight million streams within twenty-four hours of its Spotify release, breaking the record for the highest first-day streaming for a single track. It impacted American contemporary hit radio on August 29, 2017, through Big Machine Records.

A lyric video heavily based on the Saul Bass imagery used in the film Vertigo was released through Swift's official Vevo account on August 25, 2017. The video was produced by Swift and Joseph Kahn. It gained more than 19 million views during its first 24 hours on YouTube, surpassing "Something Just like This" by The Chainsmokers and Coldplay as the most viewed lyric video within that time period. As of September 2017, the lyric video on YouTube has amassed over 76 million views.

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