Eibenstock Dam (German: Talsperre Eibenstock) near Eibenstock in the Ore Mountains, Germany, is the largest dam in the Free State of Saxony in terms of the height of the dam above the valley floor, and its reservoir is the largest in volume in Saxony.

[1] The dam impounds the waters of the Zwickauer Mulde and supplies drinking water to the region of Chemnitz and Zwickau, as well as providing flood protection, delivering extra water during times of drought and, to a lesser extent, generating electricity from hydropower.

Its dimensions make it the second largest drinking water reservoir in Germany's new federal states.

In order to make way for its construction, the inhabitants of the village of Muldenhammer (also called Windischhammer or Windischthal), whose former buildings (10 homes, 1 wood pulp factory, 1 large estate for the breeding of Höhenfleckrinder cattle and a paper mill) lie today under the water surface, had to be resettled.

In addition, the Chemnitz–Aue–Adorf railway between Wolfsgrün and Schönheide Ost was interrupted.