The Winisk River is a river in northern Ontario, Canada, that starts at Wunnummin Lake and flows east to Winisk Lake. From there it continues in a mostly northerly direction to Hudson Bay. The Winisk River is 475 km long and has a drainage basin of 67300 km2. The name is from Cree origin meaning "groundhog". The river is remote and not accessible by road. Only a few isolated communities are along the river: Wunnumin Lake First Nation (on same lake), Webequie (on Winisk Lake) and Peawanuck, about 30 km from its end. It is characterized by strong currents and whitewater while flowing off the Canadian Shield into the Hudson Bay lowlands. Here the river becomes broad.

Tributaries

Provincial Park

For most of the length of the Winisk River and its banks, from Winisk Lake to the Polar Bear Provincial Park, has been designated a provincial waterway park. It is a non-operating park, meaning no fees are charged and no visitor facilities or services are present. Visitors must be experienced in travelling through isolated wilderness and skilled in handling whitewater.