Gary Cowan (born October 28, 1938) is a Canadian golfer who has achieved outstanding results at the highest class in amateur competition.

[1] Cowan reached the semi-finals of the Ontario Amateur Championship at age 17 in 1956, a record for a player so young.

Cowan finished as the low individual scorer at the 1962 Eisenhower Trophy, an international amateur team event, in Japan.

In 1966, he was victorious at the Merion Golf Club in suburban Philadelphia, after defeating Deane Beman in an 18-hole playoff.

Amateur twice at stroke play, and he remains one of only two Canadians (the first was Sandy Somerville in 1932) to win the U.S.