Casummit Lake is a lake in Kenora District, Ontario, Canada, about northeast of the community of Red Lake. The settlement of Casummit (settlement) and a mine are on the northeast shore of the lake. A fishing outfitter has a cabin on the north shore of the lake.
Hydrology Summit Lake is about long and wide, and lies at an elevation of . There is a significant unnamed island in the centre of the lake. The inflows are two unnamed creeks, one at the northwest from Joneston Lake, the other at the northeast from Richardson Lake. The primary outflow is Casummit Creek, to Birch Lake, at the southeast end of the lake, whose waters flow via the Birch River, Cat River and Albany River into James Bay. A portage leads from just west of the Casummit Creek outlet also to Birch Lake.
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