The Port Arthur Bearcats (also known as the Bear Cats) were an amateur men's senior ice hockey team based in Port Arthur, Ontario (now part of the city of Thunder Bay). Port Arthur were champions Canadian Amateur Hockey Association four times, and were chosen once to represent Canada as the Canada national men's ice hockey team at international competitions. The team won the Silver Medal in the 1936 Winter Olympics. In 1987 the 1936 team was inducted into the Northwestern Ontario Sports Hall of Fame.
The Port Arthur team played several season without a nicknames over its history, with several generic names applied to the team including the Port Arthur Ports, Port Arthur Hockey Club, and the Port Arthur Seniors. The team ceased due to World War II in 1943.
Port Arthur played the Ottawa Senators for the Stanley Cup in a 1911 challenge, losing 13–4 in a one game showdown on March 16, 1911. Port Arthur won three Allan Cup titles during the 1920s, as Canada's senior ice hockey champions. Port Arthur won the silver medal in Ice hockey at the 1936 Winter Olympics, finishing runners-up to Great Britain. Port Arthur won its fourth Allan Cup in 1939.