"March of the Pigs" is a song by American industrial rock band Nine Inch Nails from their second studio album, The Downward Spiral (1994).

[2] The song features a techno style bridge in 44 with a vocal melody based on the blues scale that ends with a cheerful piano jingle.

After abandoning a more elaborate version before filming could be completed, Reznor and the live band assembled for the then-impending Self Destruct Tour (featuring drummer Chris Vrenna, keyboard player James Woolley, guitarist Robin Finck and bassist/guitarist/keyboardist Danny Lohner) regrouped with director Peter Christopherson to film a stripped-down, minimalist music video for the song.

Throughout the video, stagehands visibly move into the frame to reset the equipment he knocks over, handing Reznor a microphone each time he needs to start singing again after an instrumental section.

When Reznor appeared as a guest programmer on the ABC Rage TV program, he explained that they just kept playing the song over and over to the point of exhaustion to get the final take.

Portions of the earlier, uncompleted video are included on the Closure DVD disc image file that appeared on file-sharing network The Pirate Bay in December 2006; this file is believed to be a leak of a completed but (so far) officially unreleased deluxe DVD reissue of the band's 1997 VHS/laserdisc long form music video Closure.

In this version of the video, the band performs the song in a red cave-like set with water at their feet, and a person with dwarfism appears.

In a 1994 episode of Beavis & Butt-head, the boys watch the video for "March of the Pigs" and enjoy much of the song except for the piano parts.