Knopp-Labach is a municipality located in the Südwestpfalz district within the state of Rhineland-Palatinate in western Germany. It is situated approximately 15 km northwest of Pirmasens and 15 km northeast of Zweibrücken.
Administratively, Knopp-Labach was previously part of the Verbandsgemeinde Wallhalben. On July 1, 2014, it became part of the Verbandsgemeinde Thaleischweiler-Wallhalben.