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.

Allan Cup Hockey (ACH), formerly Major League Hockey until 2011, is the top tier Canadian senior ice hockey league in the province of Ontario. Founded in 1990, as the Southwestern Senior "A" Hockey League, the ACH is a member of the Ontario Hockey Association and Hockey Canada. The ACH's champion contends for the Allan Cup each year. The league came to its latest incarnation when it lost several teams leaving it with two and as a result it merged with the Eastern Ontario Senior Hockey League in 2008.