The purpose of this thesis will be, after having examined generally the principles which regulate the settlement of international disputes under international law, to understand the function that the United Nations has in the settlement of disputes and, particularly, to see the role played by the General Assembly and the Security Council in preserving peace and security, including the pacific settlement of disputes. In order to do that, we cannot avoid, of course, investigating and clarifying the purposes of the United Nations as an organ of conciliation. Then we will examine the United Nations structure, particularly the General Assembly, the Security Council, and the International Court of Justice. and we will proceed to the aspects of "Great Power Diplomacy" extending within and beyond the limits of the Security Council, which, as shall be seen, is the predominantly active agency in the settlement of disputes. Upon understanding the various means of settling disputes, we may reach our conclusions about the effectiveness of the Security Council and its possibilities for the future.