The Brunnenbach is a 12 km (7.5 mi) long, right-hand tributary of the Warme Bode, which flows to the west and south of Braunlage in Goslar district in the north German state of Lower Saxony.

Shortly after its source the Brunnenbach is impounded by the Silberteich reservoir, before it continues in a southeasterly direction past the Mutter-Kind-Heim Waldmühle, a mother-and-child centre, and local campsite.

The Brunnenbach is one of the most important tributaries of the Warme Bode.

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