Circle Jerks (stylized as Ciʀcle JƎʀᴋs) are an American hardcore punk band, formed in 1979 in Los Angeles, California. The group was founded by former Black Flag vocalist Keith Morris and Redd Kross guitarist Greg Hetson. To date, Circle Jerks have released six studio albums, one compilation, a live album and a live DVD. Their debut album, Group Sex (1980), is considered a landmark of the hardcore genre.

The band’s first recordings took place in spring 1980 which appeared on Posh Boy’s first Rodney on the ROQ compilation. In July of that year, the band recorded their debut studio album, Group Sex, which was released in October 1980 on the Frontier Records label; its 14 songs totaled just 15 minutes. The album featured several songs that Morris had written while in Black Flag. That same year, the group was one of several California punk bands to be immortalized in the Penelope Spheeris documentary The Decline of Western Civilization; live versions of five songs from Group Sex appeared on the movie’s soundtrack.