Triangle is the fourth studio album by American rock band The Beau Brummels. Produced by Lenny Waronker and released in July 1967, it was the band's first album to include songs that vocalist Sal Valentino and guitarist Ron Elliott composed together. The band incorporated fantasy elements and surreal characters into the album's song titles and lyrics, and worked with a variety of session musicians to create Triangle's psychedelic musical style. The Beau Brummels were reduced to a trio—Valentino, Elliott, and Ron Meagher—at the time Triangle was recorded, as former group members Don Irving (guitars) and John Petersen (drums) left the band following the release of the group's previous album, Beau Brummels '66.

Triangle reached number 197 on the Billboard 200 albums chart and received mostly positive reviews; critics commended Elliott as a songwriter and compared Valentino's vocals to those of Bob Dylan. The single "Magic Hollow" was ranked one of "The 100 Greatest Psychedelic Classics" in a 1997 issue of Mojo magazine. Warner Japan released this album as WPCP-5252 in 1993. Collectors' Choice Music reissued the album in 2002.

In July 1966, the Beau Brummels released their third album, and first with Warner Bros. Records. Titled Beau Brummels '66, the album was a collection of cover songs and was a commercial disappointment. Critics questioned Warner Brothers' decision to not release the band's original material, which had been recorded by the band in early 1966 as their previous label, Autumn Records, collapsed. These recordings eventually appeared on the 2005 compilation album San Fran Sessions. Following the release of Beau Brummels '66, guitarist Don Irving left the group when he received an induction notice into the armed forces. Drummer John Petersen quit to join pop rock band Harpers Bizarre. By early 1967, the three remaining members—vocalist Sal Valentino, guitarist Ron Elliott, and bassist Ron Meagher—quit touring to focus on studio work. For their next album, Triangle, the band met with Warner Bros. producer Lenny Waronker, who gave the band freedom to resume recording original material. According to Elliott, "Lenny Waronker wanted to do something creative, and I was up for that." During the album's recording sessions, Meagher left the group when he was called to active duty in the Army Reserves.

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