"One Day I'll Fly Away" is a song performed by American jazz singer Randy Crawford, from her fourth studio album, Now We May Begin (1980). The song was written by Joe Sample and Will Jennings and produced by Sample, Wilton Felder and Stix Hooper. It received generally favorable reviews from music critics. The song was a commercial success in the international market at the time, reaching number one in Belgium (Flanders) and Netherlands, while peaking at number two in the United Kingdom.

"One Day I'll Fly Away" is Crawford's highest charting single, and has been covered by many artists, most notably by Nicole Kidman portraying the character of Satine in 2001 motion picture Moulin Rouge!. In 2013, Girls Aloud member Kimberley Walsh released a cover of the song as the lead single from her debut studio album, Centre Stage. More recently the song has also been covered by British Electronica trio Vaults which was featured in the John Lewis 2016 Christmas advertisement.

"One Day I'll Fly Away" was written by Joe Sample and Will Jennings, and produced by Sample, Wilton Felder and Stix Hooper. The main hook (in which the singer sings the title of the song) is itself an interpolation of Tchaikovsky's Waltz of the Flowers from his Nutcracker Suite. Jon O'Brien of Allmusic said that the song showcases Crawford's "sumptuous, soulful tones." Writing about the singer's life for The Daily Telegraph, critic Helen Brown said that "in the pouty world of the jazz chanteuse, Randy Crawford's smile is unique," adding that "even on the saddest of songs, A Rainy Night in Georgia or One Day I'll Fly Away, you could hear those trembling lips spread outwards and upwards through the tears." "One Day I'll Fly Away" got widespread radio airplay and did well in the international market, and is Crawford's highest charting single. On September 20, 1980, the song reached number two on the UK Singles Chart. It also performed well in Belgium (Flanders) and Netherlands, reaching number one in both countries.

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