Professional ratings
Aggregate scores
Source	Rating
Metacritic	69/100
Review scores
Source	Rating
AllMusic
Robert Christgau	A–
IGN	8.7/10
Now
Pitchfork	5.0/10
PopMatters
Rolling Stone
Spin
Sputnikmusic	3.0/5
Tiny Mix Tapes

Ghosts I–IV is the sixth studio album by American industrial rock band Nine Inch Nails, released on March 2, 2008 by The Null Corporation. The album's production team included Nine Inch Nails frontman Trent Reznor, studio collaborators Atticus Ross and Alan Moulder and instrumental contributions from Alessandro Cortini, Adrian Belew and Brian Viglione. Reznor described the music of Ghosts as "a soundtrack for daydreams", a sentiment echoed by many critics who compared it with the work of Brian Eno and Robert Fripp. The songs are unnamed, and are identified only by their track listing and group number.

The album is the first independent release from Nine Inch Nails following its breakup with Interscope Records, and is an almost entirely instrumental album. Ghosts was initially intended to be a five-track EP, but the final release consists of four nine-track EPs, totaling as 36 tracks. The album was released under a Creative Commons license (BY-NC-SA), and in a variety of differing packages and price points, including a USD 300 "Ultra-Deluxe Limited Edition". Ghosts was initially released digitally through the official Nine Inch Nails website without any prior advertisement or promotion. Via the official Nine Inch Nails YouTube profile, a user-generated "film festival" was announced, where fans were invited to visually interpret the album's music and post their results. Critical reception of the album has been generally favorable, with its unorthodox release attracting positive comments from many critics. Much coverage of Ghosts I–IV has compared it to the digital download releases of Radiohead's In Rainbows as well as Saul Williams' The Inevitable Rise and Liberation of NiggyTardust!, the latter of which was produced by Reznor himself. The album was nominated for two 2008 Grammy Awards in the categories of Best Rock Instrumental Performance and Best Box Set or Limited Edition Package. These nominations represented the first time music released under a Creative Commons license had been nominated for a Grammy Award.

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