This is a list of songs falsely attributed to Nine Inch Nails (or related projects), through deliberate fraud, poor track marking or honest mistake.
ACIDDANCE.MIDI
The backing music on the website for Strobe Light, this is simply a sample beat from music software.
Angel by Vinyl Sun
Claimed since the early 2000s due to a mislabelled Napster download. Official music video
At The Heart Of It All
Commonly believed to be a NIN track due to its inclusion on Further Down The Spiral, actually an entirely original composition by Aphex Twin.
Comfortably Numb live by David Gilmour and David Bowie
Frequently mislabelled as a live cover with Gilmour, Bowie and Trent Reznor, this track doesn't have Reznor on it.
Fading
Claimed to be by Tapeworm, actual artist is currently unknown.
It All Fades
Original work misattributed to NIN.
Live In Me
Appears on the Rusty Nails II bootleg. Created by the person who made the bootleg, Mike Hitman Wilson.
The Life You Didn't Lead
Unknown, listed in compilations on YouTube and is claimed to be the demo of "The Life You Didn't Lead".
Theme for Legend of Zelda
Performed by a Nintendo music cover band, this was one of the earliest songs misattributed to NIN.
Potions (Deliverance Mix) by Puscifer
"Potions" is a song by Puscifer, written by Tapeworm, and is frequently claimed to have Trent Reznor on it. He actually is simply given a writing credit, due to his work on it with Tapeworm.
Something Blue
Appears on the Rusty Nails II bootleg. Created by the person who made the bootleg, Mike Hitman Wilson.
Supernaut
Performed by 1000 Homo DJs with Reznor on guest vocals, mislabelled as NIN on some bootlegs
More to come