This master’s thesis deals with a historical overview of the Ottoman conquests in Croatia, starting with the first contact of Croats and Ottomans in the late 14th century, which began with raids carried out by the Akinji, the Turkish light cavalry, including looting, enslaving the local population and burning and demolition up until the end of 18th century when the border was formed, which we still know today. In the context of the Ottoman imperialist expansion, the administrative-territorial division of the Ottoman Empire and the parts of Croatia which belonged to the Ottoman Empire are discussed. Considering the thesis covers the subject of the urban network of Ottoman cities as well as religious and secular buildings within them, the emphasis was placed on the most numerous monuments, i.e. achievements of the Ottoman-Islamic architectural heritage - mosques, which the Turks built in large numbers in the conquered areas, and whose construction coincides with the occupation of our region, i.e. during the 16th and 17th centuries. Since the legacy of Turkish-Islamic architecture is the least researched area of Croatian art history, the thesis is citing Ottoman mosques erected in Ottoman-ruled areas within Croatia which are recorded in historical documents. Furthermore, the thesis is based on a historical-artistic analysis of the only preserved domed mosques from the 16th century situated in three Croatian cities: Klis (today known as the Catholic Church of St Vitus in the Klis fortress), Drniš (the remains now incorporated into the Franciscan Church of St Anthony) and Đakovo (today known as the Catholic Church of All Saints), of which the latter, the one in Đakovo, is regarded as the best, and most completely preserved.