This module explores the origins, evolution and role of international organisations in world politics. The aim is to understand how these institutions have developed, why states choose, refuse and fail to use these institutions as a means to achieve their objectives, and to what extent international organisations can promote international cooperation. The module takes the United Nations (UN) system as its central focus, examining its origins in 1945, the central roles played by the key organs within the UN, notably the Security Council and Secretariat, as well as member states. We will explore the UN’s thematic work in the areas of development, human rights, peacekeeping, intervention, humanitarianism, and gender equality. Finally, we will critically assess the UN’s role as a facilitator of international cooperation, peace, and security within the context of calls for reform.