Björkö (Swedish for "Birch Island") may refer to:

Places

;Sweden * Björkö, Ekerö, a Lake Mälaren island in Ekerö Municipality, Stockholm County, the location for the World Heritage Site Birka * Björkö, Öckerö, an island in Öckerö Municipality, Västra Götaland County * Björkö, Haninge, an island in Haninge Municipality, Stockholm County * Björkö, the southern part of Väddö island in northern Roslagen, Norrtälje Municipality, Stockholm County. (Also a former parish there.) * Björkö, Västervik, an island in Västervik Municipality, Kalmar County ;Finland * Björkö, Houtskär, one of the main islands of the former municipality Houtskär in the Archipelago Sea * Björkö (Korsholm), a Kvarken island in Korsholm Municipality, Ostrobothnia * Björkö, Kumlinge, an island and a village in Kumlinge Municipality in the Åland Islands * Björkö, Korpo, an island in the former municipality Korpo in the Archipelago Sea ;Russia * The Swedish name for Primorsk, Leningrad Oblast and the Beryozovye Islands in the Leningrad Oblast

History

* The Treaty of Björkö, signed by Nicholas II of Russia and William II of the German Empire in 1905 named after Björkö (Beryozovye Islands) {{disambiguation