The Ostrog Monastery (Serbian: Манастир Острог, romanized: Manastir Ostrog, pronounced [ǒstroɡ]) is a monastery of the Serbian Orthodox Church situated against an almost vertical background, high up in the large rock of Ostroška Greda, in Montenegro.

The Monastery was founded in the early 17th century by Vasilije Jovanović, the Metropolitan of Herzegovina, and is first mentioned on a geographical map of Montenegro from 1640.

His body is enshrined in a reliquary kept in the cave-church dedicated to the Presentation of the Mother of God to the Temple.

The other church, dedicated to the Holy Cross, is placed within a cave on the upper level of the monastery and was painted by master Radul, who successfully coped with the natural shapes of the cave and laid the frescoes immediately on the surface of the rock and the south wall.

[3] Đukanović and 23 Chetniks peacefully surrendered, expecting to be spared, but were all killed by the Partisans at Ostrog.

Before entering the Church of the Presentation to pray before Saint Basil of Ostrog, pilgrims make a donation of clothing, blankets or consumables like soap for the monks.