This article delves into the complex interaction between China's Belt and Road Initiative (BRI) and the Shanghai Cooperation Organization (SCO), exploring their roles in global geopolitics, security collaboration, and economic cooperation. The BRI, often referred to as the New Silk Road, represents a remarkable effort to connect nations and reshape the global economic landscape, promoting connectivity and collaboration. Within this narrative, the SCO emerges as a pivotal participant, evolving from its origins in Central Asian security to encompass a broad spectrum of social, economic, and security concerns. With India, Pakistan, and Iran joining as full members, the SCO now represents almost half of the world's population and a significant GDP share, promising transformative impacts on trade, security, and regional development. On security matters, the SCO has demonstrated its commitment to combating terrorism, extremism, and separatism through joint military exercises and intelligence sharing. The establishment of the Regional Anti-Terrorism Structure (RATS) has been instrumental in addressing security challenges and fostering regional stability. Economically, the SCO has shifted its focus to promote an integrated economic space, facilitating the free flow of goods, technology, services, and capital among member states. Under President Xi Jinping's leadership, China's Belt and Road Initiative aims to revive ancient trade routes and foster shared destinies among nations, connecting over four billion people and a substantial GDP share. Beyond economic development, the BRI also seeks to enhance domestic and regional security, reducing reliance on maritime routes for energy supply. This article concludes that the collaborative efforts of the BRI and SCO hold the promise of a more interconnected and prosperous world in which diversity and cooperation over-How to cite this paper: Azizi, S. (2024). China's Belt and Road Initiative (BRI): The Role of the Shanghai Cooperation Organization (SCO) in Geopolitical Security and