"Clocks" is a song by British rock band Coldplay. It was written and composed, as a collaboration between all the members of the band, for their second album A Rush of Blood to the Head. Built around a piano riff, the song features cryptic lyrics concerning themes of contrast and urgency. Several remixes of the track exist and its riff has been widely sampled.

"Clocks" debuted to critical and commercial success, with critics mainly commenting on the song's piano melody. It was released in the United Kingdom as the third single from A Rush of Blood to the Head, where it reached number nine in the UK Singles Chart. It was released in the United States as the album's second single, it reached number 29 on the Billboard Hot 100 and number 9 on the Billboard Modern Rock Tracks chart. It won the Grammy Award for Record of the Year.

"Clocks" was written and composed during the late stages of production of Coldplay's second album, A Rush of Blood to the Head. A riff popped into Chris Martin's mind late one night in Liverpool when he came into the studio, where he then developed it on piano. According to Martin, "Clocks" was inspired by the English rock band Muse. Martin presented the riff to the band's guitarist, Jonny Buckland, who then added a layer of guitar chords to the basic track: "He picked up his guitar [a sure sign that he likes a song] and played these brilliant chords ... It was like a chemical reaction process." (The syncopated piano arpeggio that gives the song its signature sound also bears a similarity to a syncopated arpeggio that is repeated several times in Alex De Grassi's 1981 instrumental "Clockwork".

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