Altweidelbach is an Ortsgemeinde, or municipality, located in the Rhein-Hunsrück-Kreis district within the state of Rhineland-Palatinate, Germany. It functions as a local administrative unit belonging to a larger collective municipality.
The village is part of the Verbandsgemeinde Simmern-Rheinböllen. The administrative seat for this collective municipality is situated in the town of Simmern.