Srebrenik Fortress, Medieval fortress in Srebrenik, Bosnia and Herzegovina.

Srebrenik Fortress is a stone castle that stands on steep rocks along the northeastern slopes of Majevica mountain. The structure features thick walls and a commanding tower that rises above the surrounding landscape.

No source records the year of construction or the builder; Srebrenik is first mentioned in a 1333 charter of Ban Stephen II Kotromanić. In 1363 a Hungarian army under Palatine Nicholas Kont suffered heavy losses beneath it. It changed hands repeatedly, and in 1464 Matthias Corvinus made it the seat of the Banate of Srebrenik.

The fortress contains remains of an Ottoman mosque from the early 16th century, representing different periods of regional governance and architectural styles.

The fortress sits about 5 kilometers from the town and is reached through a bridge crossing. Reaching the structure requires some physical effort due to its steep location on the mountainside.

The fortress is also called Gradina, and its whole circuit was built in a single campaign: four towers, a walled courtyard, a cistern and a residential building with a cellar, all squeezed onto a rock about 60 by 30 metres. The outer walls and tower shells are roughly 1.5 m thick, while the inner walls are thinner.