| versions =Discipline
| live =N/A
}}[[image:discipline.jpg|thumb|''Discipline Track Art'']]'''"Discipline"''' is the latest single from [[Nine Inch Nails]], and is the fourth track on Halo 27, [[The Slip]]. It contains a beat reminiscent of "[[Only (song)|Only]]" from 2005's ''[[With Teeth (halo)|With Teeth]]'' and the lyrics seem to have a sado-masochistic overtone.
The song was released to radio stations simultaneously around 2:30pm EST on April 22, 2008, being mastered only the day before, and was then made available as a free download via the official Nine Inch Nails website. When downloaded, it comes with track art and a note found in the comments box of the song info saying "Go to [[nin.com|www.nin.com]] on May 5," possibly confirming rumors of a new EP. It is possible that each square on the cover represents a track of the ep. The lyrics are also contained.