"Supper's Ready" is a song by the band Genesis. A recorded version appeared on their 1972 album Foxtrot, and the band performed the song regularly on stage for several years following this. Live versions appear on the albums Live at the Rainbow recorded in 1973, Seconds Out recorded in 1977, the compilation Genesis Archive 1967-75, and the box set Genesis Live 1973–2007. A reworked version also appears on Steve Hackett's 2012 album Genesis Revisited II and its accompanying live albums Genesis Revisited: Live at Hammersmith and Genesis Revisited: Live At Royal Albert Hall.

In an interview, Peter Gabriel summed up "Supper's Ready" as "a personal journey which ends up walking through scenes from Revelation in the Bible....I'll leave it at that". He was also quoted in the book 'I Know What I Like' by Armando Gallo as saying that the song was influenced by an experience his wife had of sleeping in a purple room, and the nightmares it gave her.AllMusic has described the song as the band's "undisputed masterpiece".

Nearly 23 minutes in length, the song is divided into seven sections. A number of musical and lyrical themes do re-appear throughout. The melody of the verse in section I reappears as a flute melody between sections II and III. The melody of the chorus in section I reappears with new lyrics in the coda to section VI. The song that comprises the majority of section II reappears briefly in instrumental form at the beginning of section VI, and then returns to form the body of section VII, with new lyrics.

One commentator regarded the structure of "Supper's Ready" as a variation of sonata form—a musicological analysis by Nors Josephson proposes that "section VII may be viewed as a Lisztian, symphonic apotheosis" of the "cyclical fanfares that originated in section II." On the other hand, the individual components of "Supper's Ready" are much closer to traditional rock songs than they are to classical pieces, even if they contain elements of both.

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