Pedro Augusto Rizzo (Portuguese pronunciation: [ˈpedɾu ˈʁizu]; born 3 May 1974) is a Brazilian retired mixed martial artist and kickboxer who competed for the UFC, PRIDE, M-1 Global, and Affliction.

Often regarded as one of the most dangerous strikers in heavyweight history, Rizzo holds notable victories over former UFC champions Mark Coleman, Dan Severn, Josh Barnett, Andrei Arlovski, Ricco Rodriguez and Ken Shamrock.

Early in his career Rizzo adopted brutal leg kicks from his master trainer Marco Ruas and also from training at the Amsterdam-based Chakuriki gym.

Rizzo was almost an unstoppable force in his early UFC run, which culminated in a highly controversial loss at the hands of Randy Couture.

A stint in PRIDE FC did not go too well for the former UFC Heavyweight title contender, and Rizzo suffered quick losses at the hands of Sergei Kharitonov and Roman Zentsov.

Rizzo returned to his winning ways on 9 March 2007, when he beat UFC veteran Justin Eilers by unanimous decision at the début show of Art of War Undisputed Arena Fighting Championship, which was held in Dallas, Texas.