The Mid-Western Junior Hockey League (MWJHL) was a junior ice hockey league in Ontario, Canada, sanctioned by the Ontario Hockey Association from 1973 until 2007. In 2007, the league became a division of the newly formed Greater Ontario Junior Hockey League along with the Western Ontario Hockey League and Golden Horseshoe Junior Hockey League. Southwestern Junior "B" Hockey League 1973 - 1974Waterloo-Wellington Junior "B" Hockey League 1974 - 1977Mid-Western Junior "B" Hockey League 1977 - 2007