In the last decade, the dynamics of diplomatic relations in Southeast Asia have undergone significant changes, influenced by geopolitical, economic and social factors. Countries in the region, including Indonesia, Malaysia, Singapore, Thailand, the Philippines and Vietnam, continue to collaborate bilaterally and multilaterally to face common challenges. One of the key moments in diplomatic relations in Southeast Asia was the formation of ASEAN (Association of Southeast Asian Nations) in 1967. This organization aims to promote economic, social and cultural cooperation among its member countries, as well as maintaining peace and stability in the region. Through forums such as the ASEAN Regional Forum (ARF) and ASEAN Plus, member countries are increasingly strengthening dialogue and collaboration on security issues. The dynamics of relations between large countries, such as the United States and China, also influence the Southeast Asian region. With China’s increasing power, countries in Southeast Asia must balance their relations between China, as a major trading partner, and the United States, which offers security protection through military agreements. China’s involvement in the Belt and Road Initiative (BRI) deepens economic ties but also raises concerns about strategic dominance. Vietnam and the Philippines are emerging as leaders in confronting China’s territorial claims in the South China Sea. These two countries are strengthening cooperation with the US on maritime and security issues. On the other hand, Indonesia, as the country with the largest population in ASEAN, takes a neutral position in this dispute, encouraging multilateral dialogue to reach a peaceful resolution. Environmental issues and climate change are also major concerns in diplomatic relations. Countries in Southeast Asia face serious challenges such as floods, forest fires and natural disasters. Cooperation in addressing climate change through ASEAN programs can increase regional resilience and promote sustainable development. The involvement of civil society in diplomacy cannot be ignored. Cultural exchanges and educational programs between ASEAN member countries have helped build understanding and tolerance among nations. Initiatives such as the ASEAN Youth Volunteer Program contribute to building the capacity of youth who can become agents of change. Sociopolitical dynamics on the domestic side of ASEAN countries also influence diplomatic relations. The pro-democracy movement, human rights issues and handling corruption are topics that are often raised in international forums. ASEAN countries need to foster tolerance, cooperation and an inclusive approach to create stability in their relations. Overall, the dynamics of diplomatic relations in Southeast Asia are characterized by complexity and challenges. Through sincere cooperation and sensitivity to the regional context, countries in the region can build a more harmonious and competitive future. This process requires involvement from all levels of society, as well as a commitment to a safe and prospective area. By exploiting existing potential, Southeast Asia can play a strategic role on the global geopolitical map.