The Haidenweiher is a large pond about 1.3 kilometres (0.81 mi) southwest of the village of Dreifelden in the county of Westerwaldkreis in Germany.

It is linked to the Dreifelder Weiher by a drainage ditch and is used today for breeding fish.

As a result of intensive and centuries-long cattle grazing by the neighbouring villages, the area around the lake became pasture and heathland.

As a result, its eggs were collected and sold as a delicacy to the castle kitchen in Neuwied.

The reserve has an area of about 35 hectares (86 acres) and lies on the terrain of Steinebach an der Wied.