The Golubac Fortress was a medieval fortified town on the south side of the Danube River, 4 km downstream from the modern-day town of Golubac, Serbia. The fortress, which was most likely built during the 14th century, 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.

Golubac, in the Braničevo District of north-eastern Serbia and on the modern-day border with Romania, marks the entrance to the Đerdap national park. It is strategically located on the embankment of the Danube River where it narrows to form the Iron Gate gorge, allowing for the regulation and taxation of traffic across and along the river. In the Middle Ages, this was done with the aid of a strong chain connected to Babakaj, a rock on the far side of the river.

The Golubac Fortress was declared a Monument of Culture of Exceptional Importance in 1979, and it is protected by the Republic of Serbia.