Akimiski Island is the largest island in James Bay, Canada, which is part of the Qikiqtaaluk Region of the territory of Nunavut. It has an area of 3,001 km2 (1,159 sq mi), making it the 163rd largest island in the world, and Canada's 29th largest island. Akimiski Island is 19 km (12 mi) from the province of Ontario. From the western side of the island, the Ontario coastline is visible.

James Bay is a large body of water located on the southern end of Hudson Bay in Canada. It borders the provinces of Quebec and Ontario, and is politically part of Nunavut. Its largest island is Akimiski Island.