Zernsdorf is a village in Dahme-Spreewald, Brandenburg, Germany.
Since 2003 it has been part of the city of Königs Wusterhausen.
[1] Zernsdorf is situated south-east of Berlin, on the banks of three lakes.
The largest of these is the Krüpelsee, which is fed by the Dahme; the other two are the Lankensee and the Ukleisee.
The main part of Königs Wusterhausen lies about 5km to the west; the state capital, Potsdam, is about 40km to the north-west.