Winisk Lake is a large, irregularly-shaped lake in the Winisk River and Hudson Bay drainage basins in northern Kenora District in northwestern Ontario, Canada. The lake is about 35 kilometres (22 mi) long and 19 kilometres (12 mi) wide and lies at an elevation of 193 metres (633 ft). The primary inflows are the Winisk River at the northeast, the Wapitotem River at the south and the Fishbasket River at the southwest. The primary outflow is the Winisk River at the north, which flows to Hudson Bay.