Pie Island, Ontario is an island in Lake Superior about 12 km (7.5 mi) long, 46 square kilometres in area, located about 10 km (6 mi) south of Thunder Bay and 25 km (15 mi) north of Isle Royale, Michigan. Pie Island is readily visible from the shoreline and high parts of the city of Thunder Bay.
When a municipality was created in 1873 by the Ontario Legislature to govern the settlements around Thunder Bay, Pie Island was included in the Municipality of Shuniah. It formed part of Island Ward until 1936 when the Island Ward was abolished by the Ontario Legislature.
There are a number of summer cottages located on the southern tip of the island.