This work aims to provide a broad picture of the global governance structure by considering all parts that belong to the field of that subject area. As there is still no general definition of global governance it is necessary to take a closer look to the theoretical aspects of international relations to figure out the foundations of the global governance concept. Due to the strong correlation to globalization, the different dimensions of the globalization process need to be described to find out about the driving forces of global governance and its predecessor programs. There are some key approaches to the global governance concept, including Rosenaus “Governance without Government”, the Commission on Global Governance and the INEF concept which depict basic ideas but also different angles of global governance. In order to understand the structure of global governance it is not only necessary to examine the main characteristics of the concept but also to have a look at the critique, the barriers and the challenges which are included in global governance. The United Nations Organization has been the central piece of global governance since World War II and is regarded as the main actor within the structure. Despite its position, the UN faces some severe struggles which need to be resolved in order to maintain a strong position in world politics. The main question of this study is whether global governance is just a theoretical idealistic concept or a realistic alternative to the United Nations.