"The Days" is a song by Swedish DJ and music producer Avicii, featuring vocals by English recording artist Robbie Williams. The song was written by Robbie Williams, Salem Al Fakir, Avicii and Vincent Pontare, and was produced by Avicii, Fakir and Pontare. The song was played for the first time in Boston, featuring uncredited vocals by Fakir. The song was released worldwide on 3 October 2014. It was released alongside "The Nights" in The Days / Nights. A planned release in the United Kingdom on 23 November 2014 was cancelled.

"The Days" is written in the key of C major, at a tempo of 127 bpm. The chord structure is based on the pop punk chord progression.

An official lyric video was also released on YouTube by the official Avicii Vevo channel. In the video, an artist (later confirmed as INO), spray-paints the lyrics of "The Days" in black against a white wall. Near the end of the video, a pan-out reveals the lyrics creating a portrait of Avicii, which is subsequently covered with splashes of coloured paint by the artist.

As of June 2017, the lyric video has been viewed more than 120 million times.

Credits adapted from CD single.

^*sales figures based on certification alone
^{^}shipments figures based on certification alone

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