Greifenstein is a municipality in the Lahn-Dill-Kreis in Hesse, Germany. Its administrative seat is Beilstein. Greifenstein covers 67.43 km2 on the eastern slope of the Westerwald range. It was named for the castle of the same name in the constituent community of the same name. Greifenstein is the site of the German Bell Museum, which holds about fifty bells that show the historical development of bell pouring and manufacture.