Biffy Clyro are a Scottish rock band formed in Kilmarnock, in 1995. The band is composed of Simon Neil (lead vocals, guitar) and twin brothers James (bass, backing vocals) and Ben Johnston (drums, backing vocals). During live performances, the trio are joined by longtime touring musicians Mike Vennart (guitar, backing vocals) and Richard "Gambler" Ingram (keyboards, guitar). Currently signed to 14th Floor Records, they have released ten studio albums. Following their first three albums, the band expanded their following significantly in 2007 with the release of their fourth album Puzzle, which peaked at No. 2 on the UK Albums Chart and was awarded a Platinum certification by the British Phonographic Industry (BPI).

Their fifth album, Only Revolutions (2009) reached number three in the United Kingdom, and went Gold within days of its release before achieving double-platinum status in August 2011. The album also received a Mercury Music Prize nomination. Only Revolutions included the commercially successful singles "Mountains", "That Golden Rule", and "Many of Horror", all of which reached the UK Top Ten. The latter reached No. 8 on the UK Singles Chart after The X Factor 2010 winner, Matt Cardle covered the song, and became the UK number one Christmas single for the year 2010. In 2011, the band was nominated for the Brit Awards for Best British Group.

At the 2013 NME Awards, they received the award for Best British Band. Their sixth studio album, the double album Opposites was released in 2013, and was their first album to reach number one in the United Kingdom, and their second to reach number one in Scotland. Their most recent album Futique was released in September 2025.

The first incarnation of what would eventually become Biffy Clyro was formed in 1995, when fifteen-year-old Ayr-based guitarist Simon Neil started playing his songs with Boyan Chowdhury (a founding member of The Zutons in 2001), then soon recruited friend Ben Johnston. Ben's twin brother James Johnston was soon recruited and the four musicians spent the next two years rehearsing, writing and covering songs. On 31 January 1995, they played their first gig under the name "Screwfish" as the support for a band called Pink Kross at the Key Youth Centre in East Kilbride, now known as Universal Connections East Kilbride. After Chowdhury's departure in 1997, the trio moved to Glasgow for studies, Neil attending the University of Glasgow, and the Johnston twins attending Stow College, studying Electronics with Music and Audio Engineering, respectively.

After playing gigs around Glasgow and receiving positive and enthusiastic reactions from audiences, the band were spotted by Dee Bahl, who soon became their manager. Bahl offered them a chance to release an independent single on Aereogramme's Babi Yaga record label: "Iname" was released on 28 June 1999, with Northsound Radio's Jim Gellatly (later of Beat 106 & Xfm Scotland) giving the band their first radio play. This first release led to the band being chosen by Stow College's Electric Honey record label to release a record: thekidswhopoptodaywillrocktomorrow was released on Nerosa on 13 June 2000, receiving airplay from BBC Radio Scotland DJ Vic Galloway. A few days prior to the release of thekidswhopoptodaywillrocktomorrow, the band were spotted at the Unsigned Bands stage at T in the Park 2000 by a Beggars Banquet representative, and were signed to the independent Beggar's Banquet soon thereafter.

On 9 April 2001, the previously unreleased "27" was released as a single. On 1 October 2001, a song from thekidswho... was re-recorded and released as a single, "Justboy"; this was repeated again on 4 February 2002, when the song "57" was released. On 11 March, the band's debut album, Blackened Sky, was released to generally positive reviews. It was around this time that the band began touring extensively, including supporting Weezer on 20 March at the Barrowlands in Glasgow. On 15 July, the fourth single from the album, "Joy.Discovery.Invention", was released as a double A-side with a newly recorded song called "Toys, Toys, Toys, Choke, Toys, Toys, Toys" (which would later also appear on their next album The Vertigo of Bliss).

They toured as part of the Kerrang tour in 2001 alongside Sunna and Hell is For Heroes, followed by their first UK wide headline tour later on in the year. In 2003, the band retreated to the Linford Manor recording studio in Great Linford, Milton Keynes, England, to record the follow-up to Blackened Sky. On 24 March, a new single was released called "The Ideal Height", followed by a further new single "Questions and Answers" on 26 May. The band's second album, The Vertigo of Bliss was released on 16 June, to positive reviews which focused on the more experimental style of the album in comparison to Blackened Sky, as well as the introduction of string sections.

After touring relentlessly for The Vertigo of Bliss, the band retreated to Monnow Valley Studio in Monmouth, Wales to record a follow-up album. As with the previous album, two singles were released before the actual album: "Glitter and Trauma" and "My Recovery Injection" on 9 August and 20 September respectively. An additional digital download was also released on 31 May, called "There's No Such Thing as a Jaggy Snake". On 4 October, the band's third album, Infinity Land was released, followed by the final single from the album, "Only One Word Comes To Mind", on 14 February 2005. On 16 February, the band performed a cover of Franz Ferdinand's "Take Me Out" live from Maida Vale on Zane Lowe's BBC Radio 1 show. Neil's side project, Marmaduke Duke, released their debut album in 2005, The Magnificent Duke, touring the UK with Marmaduke Duke, together with the Johnston twins accompanying on bass and drums.