The aim of this thesis is to describe the administration of the Croatian Banovina, that is, a detailed elaboration of its administrative structure, starting with its state-legal position within the Kingdom of Yugoslavia, and then the legislative, administrative and judicial authorities, with special reference to the Ban goverment as an executive authority, and a detailed description of the structure, scope and administrative bodies of the same. The administrative structure of the lower authorities and the territorial organization and division of the Banovina are also presented through a detailed presentation of the structure and number of the population. For the purpose of a clearer understanding of the position and importance of the Banovina Croatia, the position of the Croatian nation through the previous historical period in the Austro-Hungarian Monarchy and the Kingdom of SHS, later the Kingdom of Yugoslavia, was also discussed, and in order to create a clearer picture and context of the political circumstances at that time, the negotiations between Cvetković and Maček were elaborated in detail , which led to the creation of Banovina as well as the reactions and political attitudes of relevant political figures and legal experts of that era.