Jack Lake (Nipissing District)

Jack Lake is a lake in Nipissing District in Northeastern Ontario, Canada. The lake is in Algonquin Provincial Park, is part of the Saint Lawrence River drainage basin, and lies 750 m north of Ontario Highway 60.

The primary inflow is an unnamed stream arriving at the east, and the primary outflow is Jack Creek leaving at the east. Jack Creek flows to Mew Lake, continues to the North Madawaska River, and then via the Madawaska River and the Ottawa River to the Saint Lawrence River. The lake is at an elevation of 468 m.

The Hemlock Bluff Trail, a 3.5 km loop, leads from Highway 60 to the lake, including along a bluff on the southeast side of the lake