"Flashback" is a song by Scottish musician Calvin Harris from his second studio album, Ready for the Weekend (2009). The song was released in the UK on 2 November 2009 and features Jordanian singer Ayah Marar. Harris and Marar would later work together again on Harris's 2013 single "Thinking About You".

"Flashback" was released as the album's third single on 2 November 2009. To promote the track, Calvin was originally scheduled to perform on the UK morning talk show GMTV, however the show declined Calvin's appearance as they thought the song was "too dancy" for the programme.

The following week, Disney Channel promoted the message card for "Flashback" after the 4:30 showing of Hannah Montana, showing an image of Calvin wearing diamond sunglasses, as well as the words "Flashback [Calvin Harris]".

Harris stated on his Twitter that he was busy filming the video for the songs. The video was uploaded to Harris' official YouTube page on 13 October 2009. But then Harris removed it stating that the beat was too fast and that the actual version is at "the right speed". All scenes in the video are shot in Ibiza. It shows Harris at a penthouse, riding in a limousine, walking the streets and boarding a small boat with some girls. It also features him DJing at Pacha. It also shows Harris alone on a speedboat early in the morning while wearing white and looking at Polaroid shots of him and the girls strewn all over the boat and some washed on the sea, along with bottles and cans of liquor and some of the stuff the girls used like an Indian headdress. All the while trying to remember the events of last night because he was "drunk" the whole evening.

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