"Don't Let Me Down" is a song by American production duo The Chainsmokers. The song features the vocals of American recording artist Daya, and was released on February 5, 2016, through Disruptor and Columbia Records. The song was written by Andrew Taggart, Emily Warren and Scott Harris. Musically, the song is a trap song with influences of dance-pop. "Don't Let Me Down" received generally favorable reviews from music critics, with praise going to Daya's vocals and the song's production.
"Don't Let Me Down" was a commercial success. It became both The Chainsmokers' and Daya's first top five single on the BillboardHot 100, peaking at number three. It also became The Chainsmokers' second consecutive top 10 hit after "Roses", which peaked at number six. It also reached the top 10 in several countries, including Australia, Austria, Canada, Germany, New Zealand, Sweden, and the United Kingdom. A set of remixes for the song, was released on April 15, 2016. A music video for the song was released on April 29, 2016. The Chainsmokers and Daya appear in the video.