Amnesiac is the fifth studio album by the English rock band Radiohead, released in June 2001 by Parlophone. Recorded during the same sessions as Radiohead's previous album Kid A (2000) with producer Nigel Godrich, the album incorporates similar influences of electronic music, 20th-century classical music, jazz and krautrock. Its lyrics and artwork explore themes influenced by memory and reincarnation, with influences from ancient Greek and Egyptian mythology. Singer Thom Yorke described it as "another take on Kid A, a form of explanation."

Three singles were released from the album: "Pyramid Song", "I Might Be Wrong" and "Knives Out". Amnesiac debuted at number one on the UK Albums Chart and number 2 on the US Billboard 200 chart and had sold over 900,000 copies worldwide by October 2008. Though many critics considered it inferior to Kid A, Amnesiac received positive reviews and in 2012 Rolling Stone ranked it number 320 in their updated version of The 500 Greatest Albums of All Time.

Almost all of Amnesiac was recorded during the same sessions as its predecessor, Kid A, released eight months earlier in October 2000. The sessions took place from January 1999 to mid-2000 in Paris, Copenhagen, and in Radiohead's Oxfordshire studio. Radiohead incorporated influences from electronic music, 20th-century classical music, jazz and krautrock, using synthesisers, ondes Martenot, drum machines, strings and brass. Drummer Philip Selway said the sessions had "two frames of mind ... a tension between our old approach of all being in a room playing together and the other extreme of manufacturing music in the studio. I think Amnesiac comes out stronger in the band-arrangement way." Strings, arranged by guitarist Jonny Greenwood, were performed by the Orchestra of St John's and recorded in Dorchester Abbey, a 12th-century church close to Radiohead's studio.

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