St. Margarets is a settlement in Northumberland County, New Brunswick near the intersection of Route 11 and Route 440.
The former local service district of St. Margarets took its name from the community.
In the 2021 Census of Population conducted by Statistics Canada, St. Margarets had a population of 269 living in 113 of its 125 total private dwellings, a change of from its 2016 population of 258. With a land area of , it had a population density of in 2021.