Marienstatt Abbey is a Cistercian monastery and a pilgrimage site in Streithausen, Westerwaldkreis, Rhineland-Palatinate, in the Nister valley near Hachenburg.
The abbey has an early-Gothic Basilica with the largest organ in the Westerwald, a library, a brewery with restaurant, a shop for books and art, a guest house, and a privately supported secondary school, the Privates Gymnasium Marienstatt.