*[[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 the last show 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, although he did replace Clouser during the CRC sessionsSound designer; 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)