In the final work titled "The City of Zagreb - system and organization structure" have been elaborated the concepts related to the City of Zagreb, the origin and history, the structure of government, and the development of the city as a special territorial and administrative unit. The City of Zagreb is the main and largest city of the Republic of Croatia and at the same time the cultural, scientific, economic, political, administrative center of the Republic of Croatia with the seat of the Parliament, the President and the Government. The characteristics of the city's position, the traffic position and its formation are analyzed through the unification of the neighboring hills of Gradec and Kaptol. The self-governing sphere of the city is regulated by the Statute of the City of Zagreb. A special status has also been given to him as a unit of local self-government (city) which also has the status of a regional self-government unit through a detailed analysis of the bodies of the City of Zagreb - the City Assembly as the representative body of the citizen and the Mayor as the executive. Also will be talk about the city's administrative bodies in Zagreb who are doing business in the city. It will also be about local self-government in the city of Zagreb divided into city districts and local councils.