With Teeth (stylized as [WITH_TEETH]) is the fourth studio album by American industrial rock band Nine Inch Nails, released by Nothing Records and Interscope Records on May 3, 2005. The album was produced by Nine Inch Nails frontman Trent Reznor and long-time collaborator Alan Moulder. It also features contributions from musician Dave Grohl and future band member Atticus Ross.

In line with the band's previous material, the record features introspective songwriting influenced by Reznor's addiction to alcohol and drugs and subsequent sobriety. The album generated three singles: "The Hand That Feeds", "Only", and "Every Day Is Exactly the Same", the latter of which was released as an accompanying remix EP. The album was supported by the Live: With Teeth tour.

With Teeth was well received by critics, albeit slightly less than the band's previous work. Some complimented the aggressive composition, while others said the album was bland and criticized Reznor for a lack of originality. The album became the band's second to reach No. 1 in the U.S. and was certified gold both by the RIAA and BPI and platinum by Music Canada.

Nine Inch Nails garnered mainstream attention with their influential second album The Downward Spiral, as well as a widely broadcast live performance at Woodstock '94, becoming one of the most popular music acts of the 1990s. Reznor appeared in Time magazine's list of the year's most influential people in 1997, and Spin magazine described him as "the most vital artist in music". However, his musical output was infrequent, having released only three studio albums from 1989 to 2005 with a rough average of five years between each release. During this time, Reznor became increasingly addicted to alcohol and drugs, resulting in depression and writer's block.

The 1999 Nine Inch Nails double album The Fragile was met with generally positive reviews from music critics and eventually sold 898,000 copies. However, it failed to attain the success of its predecessor and fell from the top of the Billboard charts after only a week. Afterwards, the only original Nine Inch Nails material released until 2005 was the 2000 remix album Things Falling Apart, as well as the 2002 remix album Still and the 2001 single "Deep" from the Lara Croft: Tomb Raider soundtrack. Reznor told Spin magazine in 2005, "I was going to just drink myself or drug myself out of it. I got back to New Orleans after the Fragile tour, and I'd pretty much lost my soul."

After Reznor decided to go to rehab, he began work on a new album and found that the songwriting process moved along easier for him than in the past. He said that it was due to having "a pretty good game plan" and elaborated, "I had themes and subjects [...] as my brain started working, the songs just started to come out. I regained my self-confidence." He originally planned the album to be a concept album, complete with a storyline. He was quoted in a 2007 article as saying, "I'd come up with this kind of elaborate storyline, and the record was gonna be a concept record that had a number of pretentious elements to it. I was gonna talk about multi-layered reality and waking up in a dream you can't wake up out of, and eventually finding acceptance after you go through this period of trying to fight it. It was all kind of a big analogy for me getting sober." Pre Production of the album started around June of 2003 and ended right before the beginning of the recording of the album in mid 2004. The original title for the concept album was titled "Bleedthrough" with Reznor stating in an interview in February 2004, that the new material was "more song-oriented than The Fragile. It's much more lean. It's going to be twelve good punches in the face -- no fillers, no instrumentals, just straight to the point…It's a complicated concept record, but reduced to just simple songs. It's not epic in its scope. It's minimal and a bit brutal." In response to a question posted on October 18, 2004 to the Access section of nin.com, Reznor announced that the working title Bleedthrough had been dropped. Reznor stated that the name was changed because "it was supposed to be about different layers of reality seeping into the next, but I think some people were thinking about blood or a tampon commercial." "'Bleedthrough' is no more," Reznor wrote in a message posted on nin.com, "as the songs and concepts matured, the focus and theme of the album shifted somewhat--leaving me feeling that title was inappropriate. Or you could just say I changed my mind. Yes, the new album has a title and track list, and no I'm not telling you what it is yet."

According to an interview with Remix Magazine, 25 songs were written for With Teeth. The non-album tracks from this era are "Non-Entity" and "Not So Pretty Now". During a chat with fans in The Spiral, Reznor stated that these songs were outtakes from the With Teeth sessions, and studio recordings of them might one day surface. On March 20, 2009, Reznor released the long-awaited studio versions as part of the NINJA 2009 Summer Tour EP via ninja2009.com. On a PDF poster (containing lyrics and credits) posted to the With Teeth site and later made physically available to members of The Spiral as part of the welcome package, several extra songs were alluded to but not featured on the album. All of these songs contained lyrics in some form, though they were not entirely legible. These songs are: "Message To No One", "The Warning", and "The Life You Didn't Lead". On May 5, 2005, in the Access section of nin.com, a fan submitted the question: "In the .pdf file for the lyrics to the With Teeth album, there are what appears to be songs listed with lyrics that do not appear on the DualDisc CD/DVD album. Those songs include "Home," "Message To No One" and "The Life You Didn't Lead". Will these songs be released ever?" Reznor simply replied with "?" A song with the title "The Warning" is on Year Zero. When the 2019 Definitive Edition vinyl of With Teeth was released, the aforementioned poster was re-created as part of the packaging. Lyrics to "The Warning" were made legible and it was finally revealed that the track from Year Zero has its origins in the track from the With Teeth sessions. In a late 2003 pre-release article from Alternative Press a song named "My Dead Friend" was mentioned. Whether this is an earlier name for a song that does appear (such as "Beside You In Time") or simply didn't make the cut, is so far unknown. It is speculated that it may have become "This Isn't The Place". Similarly, there is a possibility that "The Life You Didn't Lead" informed or inspired "The Lovers". In January 2020, two separate CDs surfaced that purported to contain songs from With Teeth in various states of completion, as well as outtakes that had not previously been mentioned.The first CD was labeled With Teeth Selections on the front cover and had five tracks that were all released on the final album in some form. With Teeth Tentative Sequence 12.23.04 is printed on the spine, but this may be a mistake caused by re-using the artwork from a previous release (and forgetting to change the spine title), as this release is more of a sampler and does not contain the full sequence of the album. This CD was sold on eBay by Amoeba Music. The tracklisting correlates with pre-release info reported by Kerrang! magazine, including "Getting Smaller" and "Right Where It Belongs" having the working titles of "Getting Smaller Every Day" and "Cages", suggesting that they may have had a copy of this CD. In the wake of the first CD's auction being discussed on a NIN collecting Facebook group, a collector posted photos of his similar-looking double CD labeled With Teeth Unfinished 11.30.04. This collector had previously posted a photo of his full NIN collection in 2018, with this CD appearing in it. They claimed that they got it from their cousin, whose friend had worked as an intern at Interscope Records. The first disc contains all of the album tracks (some possibly finished, some labeled as demos) in what ended up being the final album running order. The second disc contains outtakes and demos, including previously unknown outtakes named "Cover It Up", "Good Day", and "The End". "Cover It Up" was claimed by the CD's owner to be an early version of "The Idea Of You". Tracks claiming to be from the five-track CD were posted to archive.org the same month as the eBay sale, but were found to be elaborate fakes. Neither release has actually been shared on the Internet, to date. However, in 2026, the collector who bought the With Teeth Selections auction stated that the songs on the sampler were just the final album versions, as far as they could remember. Both CDs were brought to the attention of Rob Sheridan, who stated on Twitter that the five-track CD "appears to be one of the ones I made (printing out on a home printer on cut-out CD insert template paper) that we sent out to record industry people and potential collaborators." He also commented on the veracity of the double CD. When asked on a subscriber-only Patreon Q&A about the "new" outtakes on the double CD, he stated, "I should probably not comment any further on that one, it's really not my place to talk about unreleased NIN stuff."

Reznor began recording the album at Nothing Studios in New Orleans, the last release he recorded at the location before permanently relocating to Los Angeles. The album was produced by Reznor and long-time Nine Inch Nails producer Alan Moulder, with engineering and assistance by Atticus Ross, who would later join the band as its second official member in 2016. The album was mixed in stereo and 5.1 surround sound. Nirvana drummer and Foo Fighters frontman Dave Grohl contributed drums and percussion on seven tracks. According to a statement on the official Nine Inch Nails website, Reznor stated that producer Rick Rubin was his "mentor" and "source of inspiration" throughout the planning and writing process of the album.