Greg Duhaime (August 11, 1953 – October 28, 1992) was a Canadian track and field athlete and one-time Canadian record holder in the 3000 metres steeplechase.
He was born in Espanola, Ontario.Duhaime is a four-time Canadian champion in the men's 3000 m steeplechase (1980-1982 and 1984), and a one-time national champion in the men's 5000 metres (1980).
Duhaime was one of many athletes to not compete in the 1980 Summer Olympics because of the 1980 Summer Olympics boycott against Moscow, they participated in the Liberty Bell Classic (an alternative meet for the Olympic Boycott) in Philadelphia instead.
He won a bronze medal at the 1982 Commonwealth Games in the steeplechase.
Duhaime was gay, and one of only a handful of openly gay Olympians at the time.