Leftism is the debut studio album by English electronic music duo Leftfield, released in 1995 on Columbia Records.

The album contains guest spots from musicians not associated with dance music at the time such as John Lydon from Public Image Ltd. (and formerly of Sex Pistols) and Toni Halliday from Curve.

"[3] Two reggae vocalists are featured on the album; Danny Red on "Inspection" and Earl Sixteen on "Release the Pressure".

[6] After completing the production on Leftism, Rob Daley was unhappy with how the album turned out stating that "It sounded shit [...] It seemed to have no cohesion, the tracks just didn't seem to hang well together.

[6] Q described "Original" as a "sultry rock / electro fusion"[7] A review in Slant Magazine commented that "Leftism eschews mainstream categorization and manages to reside in the leftfield of almost all the electronic genres it propagates".

[11] On 5 May 2017, the band released Leftism 22, with a remastered album as well a bonus disc of remixes by current artists, including Adrian Sherwood.

[20][21] Mixmag praised the singles for Leftism, stating that "classics like 'Release The Pressure' and 'Song of Life' were the cement that welded a whole new British house scene together.

"[2] The NME praised the album as helping keep British house music alive "when the boffins were getting complacent, the junglists were lining their pockets and the trip-hoppers were muscling in, Leftfield have returned to save the night.

"[16] The NME gave the album a nine out of ten, declaring that "there's a scope and spirit, an energy and a madness to 'Leftism' which'll make it one of the few dance derived that'll stay up there, bouncing around in the great echo chamber of futurity for years.

In his 1999 review of the duo's follow-up Rhythm and Stealth, he stated that when Leftism was released "few could honestly say it was worth the wait" and "Had 'Open Up' and 'Release the Pressure' not been included in its track listing, it seems unlikely that anyone would be talking about Leftfield nowadays.

"[23] Q specifically praised the song "Open Up", describing it as having a "revolutionary fervour that once gripped dance, and that's missing from pretty much all pop music at the moment.