The theme of this master's thesis includes architectural characteristics of the Oršić Castle in Slavetić, as well as descriptions of conservation works done on it and those that should still be carried out. The first chapter provides a description of the geographical location and history of the village of Slavetić where the mentioned castle is located, while the second chapter summarizes the rise and development of the Oršić dynasty throughout history. The Castle in Slavetić, as well as the entire estate, were extremely important to the Oršić family and their emancipation, which is proven by the fact that they often added the suffix Slavetićki to their surname. The two most interesting features of the Oršić Castle in Slavetić are certainly the fact that it belonged to the same family for centuries, from 1487 to 2019 (with short interruptions during the 19th and 20th century), and that it can be called both a castle and a burg in the same time. The castle can be described as a group of six buildings that enclose a small inner courtyard. Each of these buildings has various ground plans and architectural features that are described in detail in this thesis. Over the centuries, this castle has been extended and rebuilt several times, about which we find only little information in the scarce literature. From 1966 to 2008, the castle was leased by the Croatia State Archives, which, during that period, carried out certain conservation works, adaptations, and damage repairs. Today, the castle is privately owned by a family that uses it for residential purposes. Accordingly, the family would like to restore the castle and adapt it to their own living conditions. They are willing to carry out all the works in cooperation with the competent Conservation Service. The current state of the castle and suggestions for further action can be found in the fourth chapter of the thesis. The fifth chapter is devoted to the problem of cultural heritage as private property.