Abstract
This paper assesses the role of the United Nations in nuclear disarmament in the early postwar period and provides an explanation as to why its contribution was limited. It presents a framework of analysis concentrating particularly on the political organs of the UN. It is a view from within the World Organisation. It emphasises the difficulties the UN encountered in establishing its credentials in dealing with the requirements of the nuclear age. Finally, the paper examines the reasons of the failure of the negotiations which took place between 1945 and 1950.