Discipline is the tenth studio album by American R&B and pop singer Janet Jackson, which was released on February 22, 2008. It was her first and only album released for the Island Def Jam Music Group (under the same ownership as her first label), after her five-album deal with Virgin Records was fulfilled with the release of her album 20 Y.O.. Jackson worked with producers such as Rodney Jerkins, Jermaine Dupri, Ne-Yo, Shea Taylor, Stargate, Johnta Austin, Tricky Stewart and The-Dream on the album. Jackson's long time producers Jimmy Jam and Terry Lewis, did not contribute to the project. The album was executively produced by Island Urban president Jermaine Dupri and Jackson.

Four singles were released from the album; the first, "Feedback", was released as a digital download in December 2007. The song reached #19 on the Billboard Hot 100 chart, becoming Jackson's best charting single since "Someone to Call My Lover". The album's later singles did not share the success of "Feedback". The deluxe version of Discipline; contained a DVD documenting the production and promotion of the album and music videos.

The album received generally positive reviews, with critics arguing that it was an improvement on Jackson's two previous albums. Despite positive reviews it became one of her least successful albums. It debuted at number-one on the U.S. Billboard 200, becoming her sixth to top the chart. However sales of the album quickly fell, by June the album's promotion had officially ended. Jackson started her Rock Witchu Tour—with the support of Live Nation—in early September to positive reviews but by the fall of that month Jackson parted company with her record label. As of September, 2008, sales of the album stand at 415,000 copies in the U.S..