"Down" is a song by American girl group Fifth Harmony, featuring vocals by American rapper Gucci Mane. The song was serviced to rhythmic contemporary radio four days after its initial release and then contemporary hit radio on June 13, 2017 as the lead single from the group's upcoming third studio album. The track is a love song inspired by the group's bond as a quartet and the adversities they have faced individually and as a group. It was written by Jude Demorest, Radric Davis, and its producers Joshua Coleman and Dallas Koehlke. Musically, it contains elements of dancehall. This marks the group's first single since original member Camila Cabello departed in December 2016.

An accompanying music video for the song was released on June 8, 2017, the clip sees the girls singing in a motel as well as having an overnight pool party, interspersed with scenes of the group dancing in front of a neon lit parking lot. The song debuted and peaked at number 42 on the US Billboard Hot 100.

On May 28, 2017, Fifth Harmony began a daily countdown to the release of "Down" by sharing coordinates of each member's hometown. By going to the specified location, fans were able to decode parts of the song's lyrics through a Snapchat filter. The group shared the single's accompanying cover art on Twitter on May 30, 2017.Epic Records and Syco Music released "Down" to all major streaming services and digital retailers on June 2, 2017, as the lead single from Fifth Harmony's upcoming third studio album. It marked the group's first single as a quartet following original member Camila Cabello's departure, who left in December 2016 to pursue a solo career.

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