Fightstar is a British post-hardcore band from London, formed in 2003. The band's line-up comprises lead vocalist, guitarist and keyboardist Charlie Simpson, guitarist and vocalist Alex Westaway, bassist Dan Haigh and drummer Omar Abidi. Although generally considered a post-hardcore band, Fightstar are also known to implement metal, progressive, alternative rock and acoustic elements into their sound. During the band's initial emergence, they were faced with much scepticism due to Simpson's former pop career. However, they began to receive positive reactions to early live shows and their debut EP, They Liked You Better When You Were Dead (2005), was a critical success. Since then, their four studio albums have obtained top 40 chartings and critical praise. Fightstar's debut album, Grand Unification (2006) was regarded as "one of the best British rock albums of the past decade" by Kerrang! editor Paul Brannigan.

The band went on to receive nominations at the Kerrang! Awards for "Best British Band", before releasing their second album, One Day Son, This Will All Be Yours (2007). The following year a compilation album including b-sides and rarities titled, Alternate Endings (2008) was released. The band then self-funded and co-produced their third album, Be Human (2009), which heavily featured orchestral and choral elements. It became their highest charting album after peaking at number twenty in the UK Albums Chart. The band announced an extended hiatus in 2010, allowing its members to concentrate on other projects, including Simpson's solo album; before announcing their reunion in 2014.