"Daydreaming" is a song by the English rock band Radiohead and produced by Radiohead's longtime producer Nigel Godrich. It is a piano ballad with ambient, electronic and orchestral elements, including strings arranged by Radiohead guitarist Jonny Greenwood. Radiohead released it as download on 6 May 2016 as the second single from their ninth studio album A Moon Shaped Pool, accompanied by a music video directed by Paul Thomas Anderson.

"Daydreaming" was written by singer Thom Yorke; the rest of the band created the final arrangement. For the song's introduction, the band slowed the tape, creating a pitch-warping effect. The strings, recorded at RAK Studios in London, were arranged by guitarist Jonny Greenwood and performed by the London Contemporary Orchestra, conducted by Hugh Brunt. The orchestra had previously worked with Greenwood on his score for the 2012 film The Master. Cellist Oliver Coates said: "Nigel, Jonny and Thom all have this awesome relationship, and were so animated during the recording. I remember we were laying down the cello part at the end of 'Daydreaming' and Thom said, 'That's it – that is the sound of the record.'" Greenwood had the cellists tune their cellos unusually low for the song, creating a "growling" sound.

"Daydreaming" is a ballad with a "simple, sad" piano motif, "spooky" backmasked vocals, and ambient, electronic and orchestral elements. The song ends with reversed, warped, and slowed vocals; when reversed, Yorke seems to be singing "Half of my life", "I've found my love", or "Every minute, half of my love". Several critics felt the lyrics were coloured by Radiohead singer Thom Yorke's separation from his partner of 23 years Rachel Owen. Pitchfork noted that this period was "about as long as Radiohead have been releasing music" and saw the song as a "reckoning with those years, and, in one way or another, an elegy to them."

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