Winston Lake is a lake in the Unorganized Part of Kenora District in Northwestern Ontario, Canada. It is about long and wide and has an area of , and lies at an elevation of about north of the community of Sioux Lookout. The primary inflow is an unnamed creek from Shea Lake, and the primary outflow is Winston Creek, which flows into Lac Seul. The lake is thus in the Hudson Bay drainage basin.
See also List of lakes in Ontario
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