Märkische Schweiz Nature Park is a nature park and reserve in the district of Märkisch-Oderland, in Brandenburg, Germany. It covers an area of 204 km<sup>2</sup> (79 sq mi). It was established on October 1, 1990, and is located east of Berlin.
The park's main river is the Stobber. With a surface area of 1.37 km<sup>2</sup> the Schermützelsee is its largest lake.