Fat Pizza (simply known as Pizza, titled Fat Pizza: Back in Business from season six onwards) is an Australian comedy television series created by Paul Fenech.

The series premiered on SBS on 24 April 2000 where it aired for its first five seasons between 2000 and 2007 before moving to 7mate for its sixth and seventh seasons, in 2019 and 2021, respectively. The series has a spin-off feature length film, Fat Pizza, released in 2003, and a best-of highlights video and DVD that featured previously unreleased footage and a schoolies exposé, released in 2004. In addition to this, a theatre show entitled "Fat Pizza", starring several characters from the show, toured the Australian east coast. In 2014, the storyline of the series was combined with that of Housos to create the motion picture Fat Pizza vs. Housos. The film was shown in Australian cinemas from 27 November 2014.

Through some ironic and self-conscious references, Pizza involves themes of ethnicity and stereotypes (similar to Acropolis Now), cars, sex, illicit drugs and violence to produce its dark humour. The television program is noted for its frequent cameo appearances of numerous Australian celebrities of all varieties, including actors, comedians, professional athletes and other public figures.