The Siebenschneiderstein (Söbenschniedersteen[1]) is a glacial erratic on the island of Rügen. It lies about 22 metres away from the cliffs of Gellort[1] on the Baltic Sea beach, one kilometre northwest of Cape Arkona. It has a mass of 165 tonnes and a volume of 61 m³.[1] It belongs, like about 20 other erratics, to the legally protected geotopes on the Island of Rügen.
The rock is not the biggest erratic on Rügen (that is the Buskam at 600 m³), but it is the fourth largest and marks the northern point of the island and hence the northernmost point of Eastern Germany.