Aar-Einrich is a Verbandsgemeinde ("collective municipality") in the Rhein-Lahn-Kreis, in Rhineland-Palatinate, Germany. Its seat is in Katzenelnbogen. It was formed on 1 July 2019 by the merger of the former Verbandsgemeinden Hahnstätten and Katzenelnbogen. It takes its name from the river Aar and the Einrich hills.

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The Verbandsgemeinde Aar-Einrich consists of the following Ortsgemeinden ("local municipalities"):