The subject of this thesis is the system and organization of state administration in the Republic of Croatia. Proper organization of the state administration ensures the effective implementation of laws and bylaws, and nowadays the conditions for efficiency are created if the state administration itself is in line with European and world standards. The internal organization of the state administration in the Republic of Croatia is prescribed by the Government in the Decree on General Rules for the Internal Organization of State Administration Bodies. The very introduction presents the state administration in the broadest sense of the word. The second part deals with the historical presentation of the state administration and its internal units. The third chapter describes in more detail the structure of the state administration itself, while the fourth chapter deals with the individual detailed presentation of state bodies, whose actions are necessary for the implementation of the goals of the state administration. The fifth chapter deals with the tasks of the state administration, of which the direct implementation of laws, the adoption of regulations for their implementation, the performance of administrative supervision and other administrative and professional tasks are key to their operation. Towards the very end, the classification of the civil service system is presented, the classification of jobs, the establishment of the civil service relationship, and the payment system are discussed in detail