The Orthodox Church in Finland (Finnish: Suomen ortodoksinen kirkko, lit. 'Finnish orthodox church'; Swedish: Ortodoxa kyrkan i Finland, lit. 'Orthodox church in Finland') is an autonomous Eastern Orthodox archdiocese of the Ecumenical Patriarchate of Constantinople. The church has a legal position as a national church in the country, along with the Evangelical Lutheran Church of Finland.
With its roots in the medieval Novgorodian missionary work in Karelia, the Orthodox Church of Finland was a part of the Russian Orthodox Church until 1923. Today the church has three dioceses and 54,895 members in Finland, accounting for almost one percent of the native population of Finland. The parish of Helsinki has the most adherents. There are also 2,700 members living abroad.
