| Head of St. Margarets Bay | |
| Subdivision Type: | Country |
| Subdivision Name: | Canada |
| Subdivision Type1: | Province |
| Subdivision Name1: | Nova Scotia |
| Subdivision Type2: | Municipality |
| Subdivision Name2: | Halifax Regional Municipality |
| Subdivision Type3: | Community council |
| Subdivision Name3: | Western Region Community Council |
| Subdivision Type4: | Planning Area |
| Subdivision Name4: | St. Margarets Bay |
| Population Total: | 840 |
| Population As Of: | 2021 census |
| Area Code Type: | Telephone Exchanges |
| Pushpin Map: | Canada Nova Scotia |
| Coordinates: | 44.6828°N -63.9167°W |
Head of St. Margarets Bay is a rural community on the northeast corner of St. Margarets Bay.The community is in the Halifax Regional Municipality, 40 km west from Halifax via on Trunk 3.
The bay was named after Samuel de Champlain's mother Marguerite. His map of 1612 shows the bay as St. Marguerite Baie. The community is the site of the St. Margaret's Bay Hydroelectric System, built in 1922, the oldest hydro plant in Nova Scotia.
In the 2021 Census of Population conducted by Statistics Canada, St. Margaret's Bay had a population of 840 living in 364 of its 396 total private dwellings, a change of from its 2016 population of 782. With a land area of, it had a population density of in 2021.[1]
