Berlin-Wannsee station is a railway station opened in 1874 which lies in the Wannsee district of Berlin, the capital city of Germany. It is an important traffic junction in south-west Berlin that is served by the RegionalExpress and RegionalBahn trains of the Deutsche Bahn, the Harz-Berlin-Express of Veolia Verkehr and by the Berlin S-Bahn. In summer, Wannsee serves as the Berlin terminal for DB AutoZug car carrying trains to and from southern Europe.

Wannsee is a locality in the southwestern Berlin borough of Steglitz-Zehlendorf, Germany. It is the westernmost locality of Berlin. In the quarter there are two lakes, the larger Großer Wannsee and the Kleiner Wannsee, located on the River Havel and separated only by the Wannsee Bridge. The larger of the two lakes covers an area of 2.7 km2 (1.0 sq mi) and has a maximum depth of 9 m (30 ft).