"Duality" is a song by American metal band Slipknot, the song was released as the first single from their third studio album Vol. 3: (The Subliminal Verses), released in 2004. The music video was listed as Roadrunner Records' greatest video of all-time.

The album version of "Duality" is four minutes and twelve seconds long, and the radio edited version is three minutes and thirty-three seconds long. The song opens with lead vocalist Corey Taylor softly saying "I push my fingers into my...", leading up to lead guitarist Mick Thomson playing a riff accompanied by Craig Jones' keyboards while Taylor finishes the sentence with "...eyes", in a much more intense voice. The song is played in Drop B tuning (which most of Slipknot's songs are tuned to) and features a nu metal style.

Unlike many previous Slipknot singles, "Duality", like all the songs on Vol. 3, does not have explicit content within the lyrics. Thomson explained in an 2008 interview that vocalist Taylor was relying on explicit content in the lyrics, and wanted to try something "different". This was echoed by Jim Root in a 2011 interview. AllMusic said that "Duality"'s lyrics "aren't unique" to Slipknot but described it as "otherwise strong".Stylus Magazine said "Duality" had a "grindcore riff".Q wrote that the song "blow[s] the competition away". The BBC declared it "a pop-metal classic".

"Duality" was originally released as a CD single on May 4, 2004.

On May 25, 2004, the single was released on 7-inch red vinyl to coincide with the release of the album. There is also a 7-inch picture disc release which includes the same track listing.

"Duality" reached band records of number five and six in the Hot Mainstream Rock Tracks and Hot Modern Rock Tracks charts (although on the former chart, the record has since been broken by "Dead Memories" and eventually "Snuff"). In the UK Singles Chart, the song reached number 15. The song also charted on the Bubbling Under Hot 100 chart at number 6 (their second highest-charting song on the chart, behind "Psychosocial"). To promote the single, the band also made an appearance on The Tonight Show with Jay Leno.

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