International Organizations are key actors in global governance. They set in agenda in the global governance. The term international organization refers to “an organization established by a treaty or other instrument governed by international law and possessing its own international legal personality. International organizations may include as members in addition to states, other entities”. The united nation as an international Organization is committed to maintaining international peace and security, developing Friendly relations among nations and promoting social progress, better living standards and human rights. This paper discusses how United Nations came about, and its functions in global governance. It also examines the principles and structure of the United Nations especially the General Assembly and the Security Council. Furthermore, it brings out fundamental flaws that causes inefficiency in UN and ends with recommendations and conclusion, in this chapter we shall discuss the role of International organizations after the collapse of the soviet Union. We shall examine how, in this emerging world, there were calls for the restructuring of international organizations to cope with various new challenges including the rise of US power. The potential reform of the United Nations security Council is an interesting case of the reform process and its difficulties. We then turn to India’s involvement in the UN and its view of security council reforms. The chapter closes by asking if the UN can play any role in dealing with a world dominated by one superpower. In this chapter we also look at some other transnational organizations that are playing a crucial role.