Siethen is a village and a part of the city of Ludwigsfelde in the district of Teltow-Fläming in the federal state of Brandenburg. The name Siethen means "land of corn".

The village has a population of 600 inhabitants (2004), a size of 14,48 km and is located 3 km in the west of the town Ludwigsfelde, to which Siethen has belonged for several years.

Siethen's church was erected in the 14th century; it is located in the village center Siethen has a small castle, built in the 19th century. It was later on used as a hospital and refugee camp.

• Webpage of the city of Ludwigsfelde
• Webpage of the farm "Spargelhof Siethen"
• Webpage of the holiday village "Maerkisches Wanderdorf"

52°17′N 13°13′E / 52.283°N 13.217°E / 52.283; 13.217