Gregory John Fasala (born 10 May 1965) is an Australian former sprint freestyle swimmer of the 1980s, who won a silver medal in the 4×100-metre freestyle relay at the 1984 Summer Olympics in Los Angeles.

Coming from Victoria, Fasala was best known for being a member of the so-called Mean Machine.

Debuting at the 1982 Commonwealth Games in Brisbane, Fasala combined with Neil Brooks, Michael Delany and Graeme Brewer to claim gold in the 4×100-metre freestyle relay, gaining their nickname after collectively shaving their heads for the race.

[citation needed] In Los Angeles, he competed only in the relay, combining with Delaney, Brooks and Mark Stockwell to claim silver behind the United States team.

[citation needed] He was an Australian Institute of Sport scholarship holder.