The Kleinwaltersdorfer Bach is a 7.6-kilomentre-long, left tributary of the Freiberger Mulde in Saxony, Germany.

The stream is assessed as moderately polluted (GKL II).

[1] The stream, locally known as the Waltersbach, rises in Freiberg's Hospital Wood (Hospitalwald) and flows from there northwards through the village of Kleinwaltersdorf.

After Kleinwaltersdorf it snakes its way through a water meadow landscape to Großschirma, where it empties into the Freiberger Mulde.

The villagers of Kleinwaltersdorf call the Waltersbach "the stream" (die Bach).