Terminology of Croatian Fortification Architecture is an interdisciplinary master degree paper of double major program at the Department of Art History and the Department of Croatian language and literature. A necessity for equivalent expressions in terminology and creation of precise terms is expressed in prefaces of a number of scientific papers on fortification architecture. The aim of this paper is to analyze the terminology of fortification architecture in Croatian in the period of a new type of fortifications between the 16th and the 18th century, which is also a period of publications of the first Croatian dictionaries and the most significant works of the older Croatian literature. This new fortification type is created by the renaissance engineers and represents a new warfare strategy. By the end of the 15th century new theoretical solutions, construction forms and terminology are spread over west and middle Europe. Due to the improvement of printing press and the modifications of warfare as a consequence of the improvement of firearms, the 16th century had seen the bloom of treatise on fortification architecture. The construction methods and fortification forms started to depend more on the development of firearms and tactics. The army became larger in numbers and therefore more expensive. The new fortifications became strictly specified functional complexes whose main construction principles depended on scientific disciplines. Croatian nobility was interested in military architecture primarily as a means of defence against the The Ottoman Empire. The Ottoman wars caused devastations and migrations. The Croatian ethnic and linguistic space was divided between regions under Christian rule and those under Ottoman occupation. The essential role in the development of the Croatian language played the Jesuit order. By the end of the 16th century it had been possible to observe the development of the most of lexical semantic relations as well as the foundation of vocational and scientific terminologies. This paper analyses corpus of fortification architecture terms which were collected in the selected Croatian dictionaries from the period between 16th and 21st century. The conducted study resulted in the suggestion of lexicographical systematisation of Croatian fortification architecture.