Flatdal Church is a parish church of the Church of Norway in Seljord Municipality in Telemark county, Norway. It is located in the village of Flatdal. It is one of the churches for the Seljord parish which is part of the Øvre Telemark prosti (deanery) in the Diocese of Agder og Telemark. The white, wooden church was built in a long church design in 1654 using plans drawn up by an unknown architect. The church seats about 160 people.