Hansen Lake is a lake in the Unorganized Part of Kenora District in Northwestern Ontario, Canada. It is in the Hudson Bay drainage basin, and is within Woodland Caribou Provincial Park. The primary inflows are the Rostoul River, arriving at the southeast from Glenn Lake, and Domain Creek, at the northeast. The primary outflow, at the northwest and leading towards Rostoul Lake, is the Rostoul River, which flows via the , the Bloodvein River, Lake Winnipeg, and the Nelson River to Hudson Bay.