Peter Duncan (born 25 July 1944) is a Canadian former alpine skier who competed in the 1964 Winter Olympics and 1968 Winter Olympics. Duncan was a member of the Canadian National Alpine Team from 1960 to 1970. Duncan represented Canada at the 1964 Winter Olympics in Innsbruck, Austria competing in all off the men's alpine skiing events. In the downhill competition, he placed 34th with a time of 2:30.06 (+11.90). He finished in 19th place in the men's slalom with a total time of 2:19.10 (+7.97). In the men's giant slalom, he finished in 26th place with a time of 1:58.44 (+11.73).