"Down in It" is a song by American industrial rock band Nine Inch Nails, released in 1989. Released as the project's debut single, the song was the first to be written by Trent Reznor, the only constant member of the act. It was released as a teaser single prior to the debut album, Pretty Hate Machine.

Reznor has stated that the song was influenced heavily by "Dig It", a song by Skinny Puppy from their 1986 album Mind: The Perpetual Intercourse.

"Down in It" was the first official Nine Inch Nails release and the first single from the album Pretty Hate Machine. Initially released only on vinyl, a CD version was later created after the success of the album.

The first track on the single, "Down in It (skin)", is the mix that is found on Pretty Hate Machine. The cover art is very similar to Joy Division's first album, Unknown Pleasures. Joy Division has always been cited as an influence by Reznor, and he later covered their song "Dead Souls" on the soundtrack to The Crow.

Around the time of the single's release, the band lip-synched a performance of the song on the dance music program Dance Party USA. The video was rediscovered in 2012 and went viral after being uploaded to YouTube. Trent Reznor responded to the video's re-discovery on his Twitter account stating that the band had decided to appear on the show after deciding it was "the most absurd choice they could come up with at the time" for a television program they would be interested in performing in, and were surprised when they were actually booked to appear on the program.

The single was included in the 2015 Record Store Day–Black Friday exclusive box set, Halo I–IV.

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