*[[Aaron North]] (2005–2007)
====Bass====
*[[Rich Fownes]] (2008) (Studio only, never made it to the road, ; replaced by Meldal-Johnsen)
*[[Danny Lohner]] (1994–2003)
*[[Jeordie White]] (2005–2007)
*[[Charlie Clouser]] (1994–2001)
*[[David Haymes]] (1990)
*[[Brian Liesegang]] (Replacement for a few nights when Mars was out drunk, ; helped in the studio on ''Broken'' when Woolley was gone, ; featured in one of the music videos for "[[Gave Up]]")
*[[Nick Rushe]] (1990)
*[[Lee Mars]] (1990-1991)
*[[James Woolley]] (1991–1994)
*[[Chris Vrenna]] (1988)
*[[Gary Talpas]] (1989) (First live keyboardist for a few shows of the first Pretty Hate Machine tour, replaced by Rushe on the subsequent tour, ; also the original NIN art director)
====Drums====
*[[Alex Carapetis]] (2005)
====Other====
*[[Sean Beavan]] (Backup vocals from mixing console for the Self Destruct and Pretty Hate Machine tours)
*[[Martin Atkins]] (1991-1992) (Studio-only drummer, ; featured in music video for "[[Head Like A Hole (song)|Head Like A Hole]]")
*[[Wes Borland]] (Auditioned for guitar player in 2004, eventually replaced by Aaron North)
*[[Atticus Ross]] (Creative partner, mixer and programmer for NIN since ''With Teeth'' era, ; was guest keyboardist for several of the Wave Goodbye tour shows)
*[[Tim Neimi]] (Additional synth design on ''Pretty Hate Machine'')
*[[Keith Hillebrandt]] (1998-2001) (Studio member, songwriting credits, ; was planned to be part of a multiple-keyboardist setup for the live band Trent originally planned , but ''The Fragile'' took a different route sonically and Keith didn't play live, replaced although he did replace Clouser during the CRC sessions, ; was listed as full band member on the "I'm Afraid Of Americans" remix along with Reznor, Lohner, Clouser and Dave "Rave" Ogilvie)
*[[Dave “Rave” Ogilvie]] (1997-1999) (Was listed as full band member on the "I'm Afraid Of Americans" remix along with Reznor, Lohner, Clouser and Keith Hillebrandt)