Marc Gagnon (born May 24, 1975) is a Canadian former short track speed skater.

Born in Chicoutimi, Quebec,[1] Gagnon started his Olympic career in 1994, when he had already won the 1993 World Championships.

Four years later, in Nagano, Japan, Gagnon won a gold medal with the Canadian relay team.

The 2002 Salt Lake City Games proved to be Gagnon's best Olympics, with a total of three medals.

Even his disqualification in the 1000 m was memorable, as it was the first of an improbable series of events that led to Australian Steven Bradbury winning arguably the most unlikely gold medal in Olympic history.