Silesian Ostrava Castle, Medieval castle in Slezská Ostrava, Czech Republic.

Silesian Ostrava Castle is a castle in the Slezská Ostrava district of Ostrava, sitting on a low hill at the point where the Ostravice and Lučina rivers meet. Built in a Gothic style and later modified with Renaissance elements, it has thick stone walls, towers, and a series of interior rooms open to visitors.

The castle was built in the late 13th century by a prince of the Piast dynasty to guard a border region between Silesia and Moravia. It changed hands many times over the following centuries and was gradually transformed from a military post into a noble residence.

The castle's name comes from Slezská Ostrava, the district on the Ostravice's right bank where it stands. Its tower holds a small historical exhibition on the castle, the town, the Hussite movement and the Thirty Years' War, and its upper level gives a view over the city. Summer Shakespeare celebrations and the Slezská Ostrava Rock-Fest are held in the grounds.

The castle sits on a low rise and can be reached on foot from central Ostrava in a short walk. Wear sturdy shoes, as the path to the entrance and the interior floors include uneven stone surfaces and stairs.

Coal was mined directly beneath the castle throughout much of the 20th century, gradually weakening its foundations and causing visible cracks in the walls. A major restoration project completed in the early 2000s stabilized the structure and reopened it to the public.