"Ch-Check It Out" is a song by American alternative hip-hop group Beastie Boys, released as the first single off their sixth studio album, To the 5 Boroughs (2004), on May 3, 2004.

[1] Beastie Boys member MCA directed the song's music video under his pseudonym, Nathaniel Hörnblowér.

Reviewing the song for Billboard, Susanne Ault wrote that "Ch-Check It Out" harkens back to Beastie Boys' past works, calling the track "a bit retro" as well as its horns and bassline "much fun", comparing the chorus to the group's 1992 single "So What'cha Want".

[5][6] Beastie Boys performed the song live on The Late Show with David Letterman.

They began by emerging from a subway stop and walking through New York City until arriving at the Letterman studio and finishing the track inside.