The Nordic countries are Denmark, Norway, Sweden, Finland and Iceland, in perhaps their islands and territories. In the particular case of Finland, is part of Scandinavian (Fennoscandian) region, but it is not Scandinavian. They are Finnish.
While geographically Finland is part of Scandinavia I'm not so sure about it being Nordic, very culturally and linguistically different to the other Nordic countries.
...and don't forget, Finland is also the unofficial home of folk metal...enjoy: