AFI (abbreviation for A Fire Inside) is an American rock band from Ukiah, California, formed in 1991. Since 1998, it consists of lead vocalist Davey Havok, drummer and backing vocalist Adam Carson, bassist, backing vocalist and keyboardist Hunter Burgan, and guitarist, backing vocalist and keyboardist Jade Puget. Havok and Carson are the sole remaining original members. Originally a hardcore punk band, they have since delved into many genres, starting with horror punk and following through post-hardcore and emo into alternative rock and gothic rock.

AFI has released eleven studio albums, ten EPs, one live album and one DVD. The band first reached substantial commercial success with their fifth album, The Art of Drowning (2000), which peaked at number 174 on the Billboard 200. They then broke into the mainstream with their sixth, Sing the Sorrow (2003), which peaked at number five on the Billboard 200 and remained on the chart for 51 weeks. The album was supported by popular singles "Girl's Not Grey" and "Silver and Cold", both of which peaked at number seven on America's Hot Modern Rock Tracks chart in 2003. "The Leaving Song Pt. II" was also released as a single, reaching number 16 on the chart. Sing the Sorrow was certified Platinum by the RIAA in 2006 and is AFI's best-selling release, having sold over 1.26 million copies as of September 2009.

AFI's seventh album, Decemberunderground (2006), debuted at number one on the Billboard 200 and featured the hit single "Miss Murder", which topped the Hot Modern Rock Tracks chart, reached number 24 on the Billboard Hot 100 and appeared in the video game Guitar Hero III: Legends of Rock. The album was certified Platinum by the RIAA in 2013. Their next three albums, Crash Love (2009), Burials (2013) and AFI (2017), were also successful, peaking at increasing positions on the Billboard 200. An EP, The Missing Man, followed in December 2018. The band released their eleventh album, Bodies, on June 11, 2021.