Salvatore "Sam" Greco (born May 3, 1967) is an Australian retired full contact karateka, heavyweight K-1 kickboxer, mixed martial artist. He was the 1994 Karate World Cup champion and holds notable kickboxing victories over Branko Cikatic, Ernesto Hoost, Mike Bernardo, Stefan Leko, and Ray Sefo, as well as MMA victories over Heath Herring and Shungo Oyama.

Greco had his debut film in a small part as an enforcer in the Richard Norton movie, Under the Gun (1995) and he has also appeared occasionally in movies as a fight consultant and martial arts advisor.