The is a river in the Palatinate Forest, in the (Palatinate region of Rhineland-Palatinate. It is the strongest headwater of the Speyerbach, which is the largest river in the Anterior Palatinate. The Erlenbach rises at a height of about 460 m on the eastern slope of the Eschkopf (609 m), hence on the eastern side of the Palatinate watershed. If flows generally to the north and after only 5 km flows into the Speyerbach shortly after the latter's nominal spring at Speyerbrunn. Hydrologically speaking, the origin of the Erlenbach is the real origin of the Speyerbach.