The Ontario Hockey Association is the governing body for the majority of Junior and Senior level ice hockey teams in the Province of Ontario. 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 Ottawa District Hockey Association and Hockey Northwestern Ontario. The OHA is composed of 4 major tiers of Junior hockey controlled by the OHA: Junior "A", Junior "B", Junior "C", and Junior Development. The OHA also controls one senior hockey league, Major League Hockey.