In 1975, the OHA allowed Hockey Northwestern Ontario's Thunder Bay Twins, the defending Allan Cup champions to enter the league.

Over the course of the last fifty seasons, the OHA Senior A Hockey League captured 16 Allan Cups in 26 appearances in the National final.

If dated back to the beginning of the Allan Cup in 1908, the OHA had 24 champions in 38 appearances over the course of the league's history.

Champions Finalists The winner of the Allan Cup was named the top "amateur" team in Canada, this made them eligible to compete in the Olympic Winter Games.

The winner of the Allan Cup was named the top "amateur" team in Canada, this made them eligible to compete in the Ice Hockey World Championships.