This study examines how, in the contemporary global environment, the relationship between national sovereignty and international organizations has changed. There are concerns about how much national sovereignty is maintained or undermined as states collaborate more and more through regional organizations like the European Union and multilateral platforms like the United Nations, the World Trade Organization, and the International Monetary Fund. This study evaluates the impact of international organizations on nation-states' ability to make decisions using a descriptive and analytical methodology. The argument is that although international organizations can limit some sovereign functions, they also provide substantial advantages through cooperation, conflict resolution, and economic stability. It does this by evaluating theoretical frameworks, historical developments, case studies, and current issues.