Island Lake is a lake in northeastern Manitoba in Canada, near the Ontario border. The lake covers a total area of 1,223 square kilometres (472 sq mi), making it the 6th largest lake in the province. The lake is in the Hayes River drainage basin. The Island Lake River flows north from the northwest section of the lake into Gods Lake via Goose Lake and Beaver Lake. Gods Lake drains north through Gods River into the Hayes River.

Located on the lake are the First Nations communities of Wasagamack, St. Theresa Point and Garden Hill and to the North is Red Sucker Lake First Nation.