Wiesenburg (official name: Wiesenburg/Mark) is a municipality in the Potsdam-Mittelmark district, in Brandenburg, Germany.

Since 2000, when 14 surrounding villages voluntarily merged to form the free municipality Wiesenburg/Mark, it has had an area of 218.19 km2.

These villages became districts (Ortsteile) of Wiesenburg/Mark: The mayor of Wiesenburg/Mark is Marco Beckendorf of the Left Party (Die Linke).

Wiesenburg Castle is open to the public on selected days and for the Annual Christmas Market.

There is also a set of sculpture walks starting from Wiesenburg and heading towards Bad Belzig.