In this work will try to analyze the concept of international organizations, their definition and their role in today's world. The first part will seek to define their role, their laws, their historical development and sources of forming the system of legal rules governing social relations in the international community. Further efforts will be described their membership tj.tko be a member and under which conditions, their obligations and rights and possible sanctions that can be applied to Member States, as well as the way the organization itself in the international financiraju.Također organizations are essential and international officials (persons who work there). To persons diplomatic properties in administrative, technical service and service employees in the organization that are subject to exclusive international organization rather than their home country or to another organization and have the privileges and immunities friendly.On second part will analyze the international territorial administration and its role in the world. International Territorial Administration cerated as a result of intergovermental conflicts of some countries in which these conflicts are not only conflicts between regular forces but also clashes between paramilitary factions and in which there has been a collapse of state institutions and where to take over a chaotic condition. Therefore, the United Nations take over administrative powers in States across the civilian and military components in the executive, legislative and judical authorities. The paper provides examples of international territorial administration: the League of Nations, the United Nations, as well as review of the territorial administration in the Republic of Croatia, Bosnia and Kosovo ..