Werder (Havel) (official name derived from Werder an der Havel ("Werder upon Havel"), colloquially just Werder) is a town in the state of Brandenburg, Germany, located on the Havel river in the Potsdam-Mittelmark district, west of the state's capital Potsdam.

The Havel is a river in northeastern Germany, flowing through the states of Mecklenburg-Vorpommern, Brandenburg, Berlin and Saxony-Anhalt. The 325 kilometres (202 mi) long Havel is a right tributary of the Elbe. However, the direct distance from its source to its mouth is only 94 kilometres (58 mi). For much of its length, the Havel is navigable; it provides an important link in the waterway connections between the east and west of Germany, as well as beyond.