The Duži Monastery (Serbian Cyrillic: Манастир Дужи) is a Serbian Orthodox monastery dedicated to the Intercession of the Theotokos and located 10 kilometres west of the city of Trebinje in southern Republika Srpska, Bosnia and Herzegovina. It is situated in the Popovo Plain, not far from the coast of the Adriatic Sea. It was first mentioned in historical sources in 1694, when it served as a refuge for monks from the nearby Tvrdoš Monastery which was then destroyed by Venetians during the Morean War. That year the see of the Serbian Orthodox Eparchy of Zahumlje and Herzegovina was transferred from Tvrdoš to Duži, where it remained until 1777, when the see was relocated to Mostar.