Red is the seventh studio album by English progressive rock band King Crimson, released on 6 October 1974 on Island Records in the United Kingdom and Atlantic Records in North America and Japan. The album was recorded at Olympic Studios in London in July and August 1974, and produced by the band themselves.

Red is a progressive rock album with a noticeably heavier sound than their previous albums; it was later called one of the 50 "heaviest albums of all time" by Q. This was achieved with the performances of just three band members: guitarist and keyboardist Robert Fripp, bassist and vocalist John Wetton and drummer Bill Bruford. The dense sound of the album was created through multiple guitar and keyboard overdubs and guest appearances by musicians including former King Crimson members Ian McDonald and Mel Collins on saxophones, classical oboist Robin Miller and English jazz trumpeter Mark Charig. Many of the album's motifs were conceived during the band's live improvisations. The track "Providence" was edited down from an improvisation recorded by the previous lineup of the band, with violinist and keyboardist David Cross in addition to Fripp, Wetton and Bruford, at a live performance in Providence, Rhode Island; Cross had been fired from the band by the time the album sessions began. "Starless" was originally written for their previous album, Starless and Bible Black (1974), but was considered too primitive to be released at the time; the lengthy version included on Red was refined and performed during concerts throughout 1974.

Fripp disbanded King Crimson roughly two weeks before the release of the album. Red became their lowest-charting album at that time, spending only one week in the UK Albums Chart at No. 45 and in the US Billboard 200 at No. 66. However, it was well received among fans and critics. It has received further praise retrospectively, being recognised as one of the band's best works, and has been reissued many times.