Bad Freienwalde is a spa town in the Märkisch-Oderland district in Brandenburg, in north-eastern Germany.

The municipal area comprises the following villages: Altranft, Altglietzen, Bralitz, Hohensaaten, Hohenwutzen, Neuenhagen and Schiffmühle.

The alchemist Johann Kunckel brought it to the attention of the "Great Elector" Frederick William of Brandenburg, who, gout-ridden, arrived in Freienwalde the next year.

Recorded by the physician Bernhardus Albinus in 1685, the Kurfürstenquelle became the foundation of Freienwalde's rise as a spa town.

The development was further promoted, when in 1799 the small Neoclassical Freienwalde Castle was built according to plans by David Gilly as a summer residence of Princess Frederika Louisa of Hesse-Darmstadt, the widow of King Frederick William II of Prussia.