Cecil Charles Duncan (February 1, 1893 – December 25, 1979) was a Canadian ice hockey administrator. He served as president of the Canadian Amateur Hockey Association (CAHA) from 1936 to 1938 and led reforms towards semi-professionalism in ice hockey in Canada. He served as chairman of the CAHA committee which proposed a new definition of amateur to eliminate what it called "shamateurism", in the wake of Canada's struggles in ice hockey at the 1936 Winter Olympics. He negotiated a series of agreements to protect the CAHA's interests, and to develop relationships with all other areas of the world where hockey was played. The agreements allowed the CAHA to become independent of the Amateur Athletic Union of Canada which wanted to keep the old definition of pure amateurism. Duncan's reforms a