Zaostrog (Croatian pronunciation: [zâostroːg]) is a tourist town and harbor along the Adriatic Sea in southern Dalmatia, Croatia.

[3] It consists of two parts, an older part below a steep limestone section of the Biokovo mountain range, and a newer coastal zone.

The village is the location of the Franciscan monastery of St. Mary, which is more than 500 years old[4][5] and has an open museum, ethnological collection, gallery and a large library with over 30,000 titles, a significant part of the older Croatian literature.

The monk Andrija Kačić Miošić, known as "The Old Man Milovan", spent part of his creative life in Zaostrog.

[6] Zaostrog was called "Ostrog" in the Middle Ages and was one of the larger towns of the Narentines.