"Knee Deep" is a song recorded by American country music group Zac Brown Band with Jimmy Buffett. It was released in May 2011 as the third single from the Zac Brown Band's second major-label album, 2010's You Get What You Give. It reached number-one on the U.S. Billboard Hot Country Songs chart for one week in August 2011. The song is about laying back and having no worries (some of the lyrics are: "Only worry in the world is the tide gonna reach my chair.")

Co-writer Wyatt Durrette told the website Taste of Country that he has been a longtime fan of Jimmy Buffett and that he wanted to write a beach-themed song. He based the first verse on a breakup. Durrette brought the song to Brown, who helped him complete the second verse and melody. After neither of them could come up with a bridge, they brought the song to Jeffrey Steele, who helped them complete it.

Steve Morse of the Boston Globe called the song "festive" and a "highlight" of the album.Country Weekly reviewer Jessica Phillips said that the song was "happy-go-lucky" but "sounds like a derivation of the band's own hit "Toes"." Eric R. Danton of the Hartford Courant called it "exactly the kind of song you'd expect to hear Jimmy Buffett sing, but with more mandolin." Kevin John Coyne, reviewing the song for Country Universe, gave it a B+ rating, saying that the song "lacks spunk but radiates the same sea-breezy blissfulness" as "Toes".

The music video was directed by Darren Doane. It was filmed in Careyes, Mexico. The video features actress Juliette Lewis.

^*sales figures based on certification alone
^{^}shipments figures based on certification alone

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