Kleptomania is the fourth and final album by English rock band Mansun, released posthumously in September 2004, following the band's split, as a triple album. The first CD features the material that was to form the basis of the band's next album, which was originally going to be self-titled, and the other 2 CDs feature EP tracks, outtakes and demos.

The band split up while recording songs for the album Kleptomania, leaving unfinished tracks that were never released. An extensive explanation of the break-up has never been made public although a press release by Paul Draper stated that the band had simply "grown apart".

EMI had originally not intended to release the material until an online petition, which gained over 4000 signatures, demonstrated that there was demand for it from fans. Draper was not in a positive frame of mind about Mansun at the time, but agreed to work on the material after EMI contacted him, on the basis that the material would be released as part of a boxset featuring other material.