Brohlbach is a river of Rhineland-Palatinate, Germany. It is a left tributary of the Moselle at Treis-Karden.
The Brohlbach flows through the municipalities of Kaisersesch and Cochem in the Cochem-Zell district. The source near Düngenheim is 472 <abbr>m.a.s.l.</abbr> It then flows through the area of the municipalities of Eulgem, Gamlen, Kaifenheim, Brachtendorf, Dünfus, Forst (Eifel) and Brohl. It flows into Treis-Karden at 82 <abbr>m.a.s.l.</abbr> into the Moselle.
The Brohlbach has a catchment area of 35 km<sup>2</sup>.