"Closer" is a song by American DJ duo The Chainsmokers, featuring American singer Halsey. Andrew Taggart (one half of The Chainsmokers) also provides his vocals in the song. It was released on July 29, 2016, by Disruptor Records and Columbia Records. The song was written by Andrew Taggart, Ashley Frangipane, Shaun Frank, Frederic Kennett, Isaac Slade and Joe King, while the production was handled by The Chainsmokers. Musically it is an EDM song with a "retro" style synthesizer in the chorus.

In the United States, "Closer" became both The Chainsmokers and Halsey's first number one single on the Billboard Hot 100. The song stayed at the top spot for 12 consecutive weeks. The Chainsmokers became the first act to have four songs ("Closer" being the fourth) that top the Dance/Electronic Songs, passing Calvin Harris, who held the previous record with three. Outside of the United States, "Closer" topped the charts in more than ten countries including Australia, Canada, New Zealand, Ireland and the United Kingdom, making it both The Chainsmokers' and Halsey's first number-one single in all six countries.

The song was performed live for the first time at the Coachella Valley Music and Arts Festival in April 2016. Halsey and The Chainsmokers performed the track live at the 2016 MTV Video Music Awards as well as a remix of the song at the 2016 American Music Awards. Its music video was released on October 24, 2016. It received a nomination for Best Pop Duo/Group Performance at the 2017 Grammy Awards.

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