Justyn Warner, (born June 28, 1987) is a Canadian track athlete specializing in the 100 metres.
He is the former Canadian Junior record holder at that distance with a time of 10.26.
He anchored the Canadian 4 × 100 m relay team to a third-place finish at the 2012 Summer Olympics, but they were later disqualified for a teammate stepping out his lane.
In 2013 he anchored Canada to a bronze in the same event at the 2013 World Championships in Athletics.He is coached by Kevin Tyler.