Spacemen 3 were an English rock band, formed in 1982 in Rugby, Warwickshire, by Peter Kember and Jason Pierce, known respectively under their pseudonyms Sonic Boom and J Spaceman. Their music is known for its brand of "trance-like neo-psychedelia" consisting of heavily distorted guitar, synthesizers, and minimal chord or tempo changes.

The band drew inspiration from acts like the Stooges, the Velvet Underground, and Suicide. Following their debut album Sound of Confusion (1986), Spacemen 3 had their first independent chart hits in 1987, gaining a cult following, and through albums The Perfect Prescription (1987) and Playing with Fire (1989), went on to have greater success towards the end of the decade. However, they disbanded shortly afterwards, releasing their final studio album Recurring post-split in 1991 after an acrimonious parting of ways.

They gained a reputation as a 'drug band' due to the members' drug-taking habits and Kember's candid interviews and outspoken opinions on recreational drug use. Kember and Pierce were the only members common to all line-ups of the band. Pierce has enjoyed considerable success with his subsequent project—Spiritualized. Kember has since found acclaim for his production work with indie artists, most often under the stage name Sonic Boom.