"Nasty" is a song by American rapper Nas. The song, released via iTunes on August 9, 2011, is the first single from his tenth studio album Life Is Good. The song is produced by Nas's long-time producer and frequent collaborator Salaam Remi. The song was listed at #37 on Rolling Stone Magazine's "50 Best Singles of 2011", and was also named as the best hip-hop song of 2011 by Rap Genius. The song was later featured on the soundtrack to the 2012 film Project X.

"Nasty" was written by Nasir Jones and Salaam Gibbs, and produced by the latter under his production name Salaam Remi. Gibbs provided and arranged the use of many of the instruments making up the song's instrumentation, including bass instruments, keys, guitars and drums. The song was recorded by Gleyder Disla at Instrument Zoo Studios—a recording studio in Miami, Florida. It was mixed by Manny Marroquin, Chris Galland and Erik Madrid at Larrabee Studios, Universal City in California. Additional vocals were provided by disc jockey Big Kap, although his vocals are uncredited. "Nasty" was mastered by Chris Gehringer at Sterling Sound, New York City.

"Nasty" is a hip hop song of three minutes and four seconds in length. The song is backed by a "minimal", boom bap orientated production, with guitars and drums interspersed throughout. Unlike many modern hip hop songs, "Nasty" maintains a simple construction throughout: according to Rob Markman of MTV News, the song consists of nothing more than "hard rhymes over an infectious loop". Evoking many of the "infamous park jams" held in the Queensbridge district of New York City in the 1980s, a disc jockey can be heard shouting "Are y'all ready to see Nasty Nas?" as the song begins.

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