Karhusaari (Finnish), Björnsö (Swedish) is a subdistrict of Helsinki, Finland.

Karhusaari
Björnsö
Position of Karhusaari within Helsinki
Position of Karhusaari within Helsinki
Country Finland
RegionUusimaa
Sub-regionGreater Helsinki
MunicipalityHelsinki
DistrictÖstersundom
Population
381
Subdivision number58
Neighbouring subdivisionsÖstersundom, Talosaari, Sipoo

60°15′N 25°13′E / 60.250°N 25.217°E / 60.250; 25.217