Rettert is a municipality located in the district of Rhein-Lahn within the state of Rhineland-Palatinate in western Germany. It serves as a local administrative unit and is part of the association community of Aar-Einrich.
The town is situated in a region characterized by its rural landscape in the heart of western Germany. As a member of the Aar-Einrich association, it shares regional governance and infrastructure with neighboring communities within the Rhein-Lahn district.