Fat Pizza is a 2003 Australian comedy film based on the Pizza television series, both of which were created, produced, written and starred in by Paul Fenech. The film's story takes place between seasons two (episode "Desert Pizza") and three (episode "Brand New Pizza") of the television series. It features Rebel Wilson's first movie credit.

It was produced by Village Roadshow Pictures and SBS Independent (uncredited). It was filmed in the Canterbury-Bankstown region of Sydney, specifically Bass Hill and Chullora. Scenes were also filmed in the Hills District of Sydney, at Kellyville and Norwest Business Park. It was released by Roadshow Films on 10 April 2003 and made $2.1 million at the box office.