Berford Lake (French: lac Berford) is a lake in South Bruce Peninsula, Bruce County in southwestern Ontario, Canada. It is the source of the Rankin River, is part of the Great Lakes Basin, and is about 7 kilometres (4.3 mi) northwest of the community of Wiarton. The lake has several unnamed inflows at the east, southeast, and south. The primary outflow is the Rankin River, which flows via the Sauble River to Lake Huron.