William Abraham Hewitt was a Canadian sports executive and journalist, also widely known as Billy Hewitt. He was secretary of the Ontario Hockey Association (OHA) from 1903 to 1966, and sports editor of the Toronto Daily Star from 1900 to 1931. He promoted the establishment of the Canadian Amateur Hockey Association (CAHA), then served as its secretary-treasurer from 1915 to 1919, registrar from 1921 to 1925, registrar-treasurer from 1925 to 1961, and a trustee of the Allan Cup and Memorial Cup. Hewitt standardized player registrations in Canada, was a committee member to discuss professional-amateur agreements with the National Hockey League, and negotiated working agreements with amateur hockey governing bodies in the United States. He oversaw referees within the OHA, and negotiated common rules of play for amateur and professional leagues as chairman of the CAHA rules committee. After retiring from journalism, he was the managing-director of Maple Leaf Gardens from 1931 to 1948, and chairman of the committee to select the inaugural members of the Hockey Hall of Fame in 1945.

The Ontario Hockey Association (OHA) is the governing body for the majority of junior and senior level ice hockey teams in the province of Ontario. Founded in 1890, the OHA is sanctioned by the Ontario Hockey Federation along with the Northern Ontario Hockey Association. Other Ontario sanctioning bodies along with the OHF include the Hockey Eastern Ontario and Hockey Northwestern Ontario. The OHA controls three tiers of junior hockey; the "Tier 2 Junior "A", Junior "B", Junior "C", and one senior hockey league, Allan Cup Hockey.