Camp Pathfinder Island sits on Source Lake in Algonquin Provincial Park, Ontario, at the headwaters of the Madawaska River.

Established in 1914, it is one of Canada's longest-running boys' summer camps and is best known for its canoe tripping program, which explores the backcountry of Ontario and Quebec using traditional wood-and-canvas canoes painted a distinctive bright red.

The camp occupies an island on the lake — commonly called Camp Pathfinder Island — and draws campers ages 7–16 from across the United States, Canada, and overseas. Beyond the summer season, the camp also hosts coed school, outdoor, and family groups.

The surrounding land is the traditional and unceded territory of the Algonquin Anishinaabeg.