Beilen is a town in the Dutch province of Drenthe. It is a part of the municipality of Midden-Drenthe, and lies about 16 km south of Assen. The old Reformed church is the only remaining truly old building; a large fire destroyed a major part of Beilen in 1820. Beilen has a railway station- Beilen railway station. The biggest employers in Beilen are the former DOMO milk powder factory and the psychiatric hospital GGZ Drenthe.