Reid Coolsaet (born July 29, 1979) is a Canadian long-distance runner who competes in the marathon.

[1] He made his first international appearances for Canada at the IAAF World Cross Country Championships, running at the annual in 2002 and then 2004–2006.

[3] On the track, he won the silver medal over 5000 meters at the 2005 Summer Universiade then represented his country at the 2005 World Championships in Athletics.

[2] He returned to the Toronto race the following year and knocked over five minutes off his personal best, recording a time of 2:11:22 hours for tenth place.

This time qualified him for the 2012 London Olympics, along with fellow Canadian Eric Gillis, in which he placed 27th.