Loveless (stylized in lowercase) is the second studio album by the Irish-English rock band My Bloody Valentine. It was released on 4 November 1991 in the United Kingdom by Creation Records and in the United States by Sire Records. The album was recorded between February 1989 and September 1991, with vocalist and guitarist Kevin Shields leading sessions and experimenting with guitar vibrato, nonstandard tunings, digital sampling, and meticulous production methods. The band recorded at nineteen different studios and hired several engineers during the album's prolonged recording, with its final production cost rumoured to have reached £250,000 (equivalent to £480,000 in 2021).

Preceded by the EPs Glider (1990) and Tremolo (1991), Loveless reached number 24 on the UK Albums Chart and was widely praised by critics for its sonic innovations and Shields' "virtual reinvention of the guitar". However, after its release, Creation owner Alan McGee dropped the band from the label as he found Shields too difficult to work with, a factor alleged to have contributed to the label's eventual bankruptcy. My Bloody Valentine struggled to record a follow-up to the album and broke up in 1997, making Loveless their last full-length release until their eventual reunited effort m b v in 2013.

Since its release, Loveless has been widely cited by critics as one of the greatest albums of all time, a landmark work of the shoegaze subgenre, and as a significant influence on various subsequent artists. In 2012, it was reissued as a two-CD set, including remastered tracks and a previously unreleased half-inch analogue tape version, and peaked on several international charts. In 2013, Loveless was certified silver by the British Phonographic Industry (BPI).