This thesis explores the pressing need for reform within the United Nations Security Council, a key organization in global governance, in the form of a case study. The main purpose of the research is to understand how its reform could enhance its legitimacy while attending to the possible opposition from the USA, China, and Russia. It encompasses historical information, from the League of Nations to the reform proposals throughout history, culminating in the present debates, as well as useful theoretical approaches for the analysis. Through the Syrian Civil War, it describes the Council struggle to handle contemporary geopolitical issues. The insights of the Intergovernmental Negotiations Framework and the Elements Paper are crucial to research the current reform debates, and other literature from scholars, International Organizations and media are also employed. The analysis investigates the research question and hypothesis, and the conclusion helps summarize the findings. The thesis serves as a call for a better articulated Security Council that can better confront the complexities of our multipolar world with effectivity and effectiveness.