Zaostrog (Croatian pronunciation: [zâostroːg]) is a tourist town and harbor along the Adriatic Sea in southern Dalmatia, Croatia. It is located between Makarska and Ploče. It consists of two parts, an older part below a steep limestone section of the Biokovo mountain range, and a newer coastal zone. Olive growing is prominent in the area.
Dominating the village for more than half a millennium is the old Franciscan monastery of St Mary, which has an open museum, ethnological collection, gallery and a large library with over 30,000 titles, a significant part of the older Croatian literature.
Brother Andrija Kačić Miošić, known as "The Old Man Milovan", spent part of his creative life in Zaostro. He is one of the most prominent Croatian folk poets. Zaostrog was called "Ostrog" in the Middle Ages and was one of the larger towns of the Narentines.