Southern Harbour is a town in the province of Newfoundland and Labrador, Canada. The town had a population of 313 in the Canada 2021 Census.
In the 2021 Census of Population conducted by Statistics Canada, Southern Harbour had a population of living in of its total private dwellings, a change of from its 2016 population of . With a land area of , it had a population density of in 2021.