"A Day in the Life" is a song by the English rock band the Beatles that was released as the final track of their 1967 album Sgt. Pepper's Lonely Hearts Club Band. Credited to Lennon–McCartney, it was written mainly by John Lennon, with Paul McCartney contributing the song's middle section. Lennon's lyrics were inspired by contemporary newspaper articles, including a report on the death of Guinness heir Tara Browne. The recording includes two passages of orchestral glissandos that were partly improvised in the avant-garde style. As with the sustained piano chord that closes the song, the orchestral passages were added after the Beatles had recorded the main rhythm track.

A supposed drug reference in the line "I'd love to turn you on" resulted in the song initially being banned from broadcast by the BBC. Since its release on Sgt. Pepper, "A Day in the Life" has been issued as a B-side and also on various compilation albums. It has been covered by artists such as Sting, Bobby Darin, José Feliciano, Wes Montgomery, the Fall, Neil Young, Eric Burdon, Tori Amos, Jeff Beck, the Bee Gees, Robyn Hitchcock, Chris Cornell and Phish. Since 2008, McCartney has included the song in his live performances. It was ranked the 28th greatest song of all time by Rolling Stone magazine. In another list, the magazine also ranked it as the greatest Beatles song.

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