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 313 living in 152 of its 209 total private dwellings, a change of -20.8% from its 2016 population of 395. With a land area of 5.39 km² (2.08 sq mi), it had a population density of 58.1/km² (150.4/sq mi) in 2021.

47°43′20″N 53°57′12″W / 47.72222°N 53.95333°W / 47.72222; -53.95333