'Toxicity' is sophomore release by the Armenian-American heavy metal band System of a Down.

Released on September 4, 2001 by Columbia Records, the album peaked at number one on both the Billboard 200 and the Canadian Albums Chart. It has since been certified triple-platinum by the Recording Industry Association of America.

Categorized under a varying array of "metal" labels, 'Toxicity' features elements of multiple genres of music, such as folk, progressive metal, progressive rock, jazz, thrash metal, Middle Eastern music, and Greek music.