The Finstergrund Pit (German: Grube Finstergrund) near Wieden in the Black Forest in Germany is an abandoned medieval silver and lead mine that was also used in the modern era to extract fluorite and baryte.

The most important lodes in the region around Wieden are the fluorite-barite lodes known as Tannenboden, Anton, Werner II, Hoffnung and Finstergrund, which all run in a north to south direction.

The latter is 3.5 km long and the most significant hydrothermal lode in the area.

The visitor mine (Gallery 5) runs along this lode for 430 metres.

The country rock is formed by paragneisses and migmatite.