The Golubac Fortress (Serbian: Голубачки град or Golubački grad, Hungarian: Galambóc vára, Bulgarian: Гълъбец, Romanian: Cetatea Golubăț, Turkish: Güvercinlik Kalesi) was a medieval fortified town on the south side of the Danube River, 4 km (2.5 mi) downstream from the modern-day town of Golubac, Serbia. According the recent discoveries, the fortress, which was built during the 14th century by Medieval Serbian state, is split into three compounds which were built in stages. It has ten towers, most of which started square, and several of which received many-sided reinforcements with the advent of firearms. Towers were not connected for easier defense. Also inside the fortress were found Serbian Medieval frescos.

Golubac Fortress has had a tumultuous history. Prior to its construction it was the site of a Roman settlement. During the Middle Ages, it became the object of many battles, especially between the Ottoman Empire and the Kingdom of Hungary. It changed hands repeatedly, passing between Turks, Bulgarians, Hungarians, Serbs, and Austrians, until 1867, when it was turned over to the Serbian Knez, Mihailo Obrenović III. Now, it is a popular tourist attraction in the region and a sightseeing point on Danube boat tours.

The fortress has a distinction of successfully repelling over 120 conquering attacks during history.