Mark Anthony McKoy (born December 10, 1961) is a retired Canadian track and field athlete, winner of 110 metres hurdles at the 1992 Summer Olympics.
Born in Georgetown, Guyana, Mark McKoy spent his youth in England, before moving to Canada as a teenager. He attended Clemson University in 1980, but dropped out.
McKoy came to the international athletics scene in 1982 by winning a gold medal in 110 m hurdles and silver in 4 x 100 m relay at the Commonwealth Games. In the next year McKoy finished fourth at the first World Championships and repeated this place at the 1984 Summer Olympics.
In 1986, McKoy repeated his victory in 110 m hurdles at Commonwealth Games and turned his 4x100 m relay silver to gold medal, but finished seventh at the 1987 World Championships.
McKoy finished seventh in the hurdles at the 1988 Summer Olympics in Seoul, as he hit a number of hurdles in the final. His compatriot Ben Johnson tested positive for banned substances at the Games. Over the course of the Dubin Inquiry, McKoy was another of Charlie Francis's trainees to admit to doping and he was banned for two years.