"Mountains" is a single by Scottish band Biffy Clyro, released on 18 August 2008. Originally released as a 'non-album' single, "Mountains" is the band's highest charting single to date on the UK singles chart, peaking at #5. The song was later included on the band's fifth studio album, Only Revolutions. The song is the 40th biggest selling rock song of the 21st century in the United Kingdom with sales of 200,000.