Erfweiler is a municipality in Südwestpfalz district, in Rhineland-Palatinate, western Germany.

[3] Erfweiler lies in the German part of the Wasgau, as the southern end of the Palatine Forest and northern part of the Vosges are also called, and belongs to the natural regional of the Dahn Rockland.

[3] Its neighbouring communities in clockwise order are Hauenstein, Schwanheim, Busenberg, Schindhard and Dahn.

In Erfweiler district there are also around a dozen rock formations that are classified as natural monuments, including the Hegerturm.

Erfweiler is home to an unusual descendant of the traditional card game of German Schafkopf, known as Bauernstoss.