"Greatest Day" is a song by British pop group Take That. It was released through Polydor Records on 24 November 2008 as the lead single from their fifth studio album, The Circus (2008). The song was written and produced by Take That and co-produced by John Shanks.

The song reached number one on the UK Singles Chart, becoming the band's eleventh UK number-one single. It has since been certified Gold in the United Kingdom selling over 520,000 copies.

"Greatest Day" was written by Take That and produced by John Shanks. The song was written and recorded at Sarm West Studios in Notting Hill and was mixed in Los Angeles at the Jim Henson Studios, Gary Barlow revealed on an episode of The Xtra Factor in 2011 that it took him 3–4 hours to write this song.

The video for "Greatest Day" was filmed on location in Los Angeles on top of a 60 storey building in the downtown area and has become an iconic for the band. It was directed by Meiert Avis, who previously shot videos for U2, Damien Rice, Bruce Springsteen and Bob Dylan. The band shot the video while visiting producer John Shanks in the city who was mixing the album. It shows the band performing the song as they look on the sun setting in LA before they are beamed up into a light as the song finishes. The video premiered on AOL on 22 October 2008.

"Greatest Day" debuted at number one on the UK Singles Chart upon its release, and became the band's 11th number-one single. It stayed at the top spot for one week before being succeeded by Leona Lewis. In Ireland, the single peaked at number two. The single also charted in the top 40 in Germany, The Netherlands, Denmark and Hungary.

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