Toxicity is the second studio album by the American heavy metal band System of a Down, released on September 4, 2001, by American Recordings and Columbia Records. Expanding on their 1998 eponymous debut album, Toxicity incorporates more melody, harmonies, and singing than the band's first album. Categorized primarily as alternative metal and nu metal, the album features elements of multiple genres, including folk, progressive rock, jazz, and Armenian and Greek music, including prominent use of instruments like the sitar, banjo, keyboards, and piano. It contains a wide array of political and non-political themes, such as mass incarceration, the CIA, the environment, police brutality, drug addiction, scientific reductionism, and groupies.

System of a Down is an American heavy metal band formed in Glendale, California, in 1994. Since 1997, the band has consisted of founding members Serj Tankian ; Daron Malakian ; Shavo Odadjian ; along with John Dolmayan (drums), who replaced original drummer Andy Khachaturian.