The Ostroh Castle (Ukrainian: Острозький замок, Ostroz'kyi zamok, Polish: Zamek w Ostrogu) is a castle in the city of Ostroh, located in the Rivne Oblast of western Ukraine. In the 14th, 15th and 16th centuries, the castle was the key stronghold of the powerful House of Ostroh. Today it is in ruins.
The castle itself is located in a relatively small elevated oval plaza. The area's natural geography helped to fortify the complex; the southern and eastern sides of the fortress raised upon a 20-meter high cliff, and the northern and western sides separate the city by series of trenches (moats) that replaced the big ravine.
The first wooden fortifications were built in the area before the 1241 Mongol invasion of Rus, during which they were subsequently destroyed. The ruins were later reconstructed by Knyaz Daniil from the Ostrogky family on the city's Sudovy Hill (castle hill). Since then, more additions and reconstructions were carried out, although the complex still retains its Medieval architecture.
The castle complex consists of four main structures: the Guard Tower (Vezha murovana) where the castle's museum is located, the Bohoyavlenska Church, the New Tower, and the Belltower (constructed in 1905).
A small park sits right next to the castle, separated by a small moat. A monument was placed in the park in 1978, commemorating the 400 anniversary of the foundation of the Ostroh Academy. A building used to stand in the same location, in which the "Azbuka" (alphabet) and the Ostrog Bible were printed by Ivan Fedorov.

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Preserved remains of the walls of the western and southern dvoh'ya ¬ Rusnya towers, fragments of wall between the towers, the ruins of the palace and chapel, which determine how Novomalynskyy castle monument of defensive architecture of the fourteenth and seventeenth centuries. Volyn ... 
 The castle was built on a hill above the river Zbytenka. The area, once called the deaf, in 1392 the Polish king Wladyslaw Jagiello gave the ownership of which Prince Svidrigaylo and founded Murovane building. In 1430 Glukh became the property of the family Malyn. In the XVI century. Jan Malyn renamed the settlement in Novomalyn. Then, apparently, he continued to build the castle, the ruins of which have survived. By planning the configuration lock close to the pentagon pentagon with corner tower and entrance gate in the north-east wall. For typological features regular protobastionne fortification was surrounded by walls and a moat. 
  
In the second half of the XVII century. along the south wall, built a two-story baroque palace. Since 1802 the castle became the property Sosnowski, who continued its development, including building was built along the western wall, reconstructed northern corner tower, turning it into a chapel. To lock housing used in 1939 during World War II the castle suffered considerable damage. Preserved remains of the walls of the western and southern two-story towers, fragments of wall between the towers, the ruins of the palace and chapel, which determine how Novomalynskyy castle monument of defensive architecture of the fourteenth and seventeenth centuries. Volyn. 
  
  
Information and photo number 2 of the book "Castles and Fortresses" (2007r.m.Kyyiv, "Art")