Östersundom (previously known in Finnish as Itäsalmi) is a subdistrict of Helsinki, Finland, near to the border of Sipoo. The area previously belonged to the municipality of Sipoo, but it was annexed to Helsinki on January 1, 2009 as part of the Southwest Sipoo Association (),Helsinki laajenee Lounais-Sipooseen (in Finnish) although the municipality of Sipoo opposed the idea.Sipoon kunta valittaa päätöksestä (in Finnish)
Östersundom Manor and its side manor Björkudden, where Zachris Topelius lived for the last years, are located in Östersundom.Museovirasto: RKY Östersundomin kartano (in Finnish)
See also East Helsinki Itämetro Sipoo
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