The Ascherbach is a left tributary of the Lichte in Thuringia, Germany, and is 4 km long.

The Ascherbach rises in Neuhaus am Rennweg (city quarter Schmalenbuche) close to the Rennsteig, the watershed between Franconia and Thuringia in the Thuringian Highland.

On its way northeast through the Nature Park Thuringia Wald, the Ascherbach flows first through the Schmalenbuche (city quarter of Neuhaus am Rennweg), terns to east and follows the so-called Neuhaeuser Grund (Neuhaus Valley), and finally to reach the housing estate Ascherbach (western municipality part of Lichte).

In earliest documentary records, which go back to 1386, the Ascherbach was named Glaseseiff (placer gold deposit).

Recreational placer miners continue to find occasional gold nuggets.