Desai Williams (born June 12, 1959 in Basseterre, St. Kitts and Nevis) is a former sprinter from Canada, who won an Olympic bronze medal in 4 x 100 metres relay in Los Angeles 1984.
Competing at the two first World Championships, where he reached the semi-final (1983 and 1987), he set his personal best 200 metres time with 20.29 s in 1983 and his 100 metres personal best time of 10.11 s from a 6th-place finish at the 1988 Olympic Games in Seoul, South Korea.
Williams trained with the Scarborough Optimists Track Club which was affiliated with the Ben Johnson scandal. Club coach Charlie Francis, working with Dr. Jamie Astaphan, had supplied performance-enhancing drugs to Johnson, Williams, Tony Sharpe, Angella Taylor, Mark McKoy and others.
He now works as the speed coach for the Toronto Argonauts and is one of the most respected sprint coaches in eastern Canada. He currently trains Olympic athletes Tremaine Harris, Phylicia George and Justyn Warner among others.