Marienthal Abbey (German: Kloster Marienthal) was a Franziscan monastery in the Westerwald in the present-day county of Altenkirchen in the German state of Rhineland-Palatinate.
Today Marienthal is a village in the municipality of Seelbach bei Hamm (Sieg).
On 30 June 2011 it had a population of 55.
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