"Calypso" is a song written by John Denver in 1975 as a tribute to Jacques-Yves Cousteau and his research ship, the Calypso. The song was featured on Denver's 1975 album Windsong.

Released as the B-side of "I'm Sorry", "Calypso" received substantial airplay, enabling it to chart on the Billboard Hot 100. After "I'm Sorry" fell out of the #1 position, "Calypso" began receiving more airplay than "I'm Sorry," thus causing Billboard to list "Calypso" as the new A-side. Hence, "Calypso" is itself considered a #2 hit on the Hot 100.

John Denver was a close friend of Jacques-Yves Cousteau. Calypso was the name of Jacques Cousteau's research boat that sailed around the world for ocean conservation.

A filk song exists in Star Trek fandom (and has been quoted in Chapter 8 of Diane Duane's Star Trek novel The Wounded Sky), based on John Denver's "Calypso," but adapted to the voyages of the Enterprise: "To sail on a dream in the sun-fretted darkness, to soar through the starlight unfrightened alone...."

Additionally, Tom Smith wrote parody lyrics for the song, which he titled "Callisto," referring to a sexual desire for Callisto, originally a villainess in the TV show Xena: Warrior Princess and then one of Xena's enemies. After Callisto was redeemed in the Xena stories, he wrote an extra verse and a variation on the refrain that attacked her for having stopped being evil.

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