The Dosse is a river in the district of Ostprignitz-Ruppin in the northwestern part of Brandenburg, Germany. It is a right tributary of the Havel. The Dosse is 94 km long, with its source on the border between Mecklenburg-Vorpommern and Brandenburg, arising out of three small brooks that unite after four kilometres. It flows generally south, through Wittstock, Wusterhausen and Neustadt an der Dosse, before joining the Havel near Havelberg in Saxony-Anhalt.