South Algonquin is a township municipality in Nipissing District, Ontario, Canada. Located south of Algonquin Provincial Park, it is the sole populated portion of the district that lies south of the traditional dividing line between Northern Ontario and Southern Ontario and is closer connected to Renfrew County as opposed to the core portions of Nipissing District. The township had a population of 1,096 in the Canada 2016 Census.