Finnhamn is an island in the Stockholm archipelago. It is in Österåker Municipality and lies to the east of Ingmarsö and to the west of Husarö. The name is derived from the Finnish boats which called into the natural harbour on their way to and from Stockholm.
A wealthy coal merchant built a house here in 1915 and this is now a youth hostel which is open all year round. Finnhamn was bought by Stockholm City in 1943.
Two companies, Cinderellabåtarna and Waxholmsbolaget, have scheduled ferry services to the islands. The journey takes around two and a half hours from the centre of Stockholm.
Other facilities on Finnhamn are holiday cabins, and a seasonally open restaurant and shop.