The geopolitical dynamics of Southeast Asia are currently receiving great attention amidst global tensions. This region is a crossroads of global trade routes and a place of interaction for major powers such as the United States, China and Russia. In this analysis, we will explore the factors that influence Southeast Asian geopolitics. First, the existence of the South China Sea has become a flashpoint in geopolitical tensions. These waters are very strategic, because they hold major trade routes and are rich in natural resources. China, with its unilateral claims through the “nine-dash line” map, is often at odds with neighboring countries such as Vietnam and the Philippines. This tension has encouraged ASEAN countries to strengthen defense and diplomatic cooperation. Second, the role of the United States in maintaining regional stability is also very significant. Through the “Free and Open Indo-Pacific” policy, the US seeks to respond to China’s expansion of influence in Southeast Asia. The strategic tools used by the US include military agreements, security assistance, and strengthening the naval presence in these waters. This creates new tensions, especially when involving Australia, Japan and India within the framework of a strategic partnership. Third, the internal dynamics of ASEAN countries are also changing the geopolitical landscape. Each country has its own interests and challenges, ranging from ethnic, political, to economic issues. For example, Myanmar is facing a humanitarian crisis that is disrupting regional stability. Political uncertainty in countries such as Thailand and the Philippines is also a factor influencing their foreign policies, as well as affecting ASEAN unity. Fourth, the issue of climate change and cyber security is emerging as a new challenge in geopolitics. Countries in Southeast Asia face increasing risks of natural disasters due to climate change. This requires cross-country collaboration for risk mitigation and sustainable development. In addition, cyber threats are also increasing, with attacks on critical infrastructure that can affect national stability. Furthermore, diplomatic relations between ASEAN countries and a number of major powers, including China and the US, play an important role in regional geopolitics. Multilateral diplomacy through ASEAN prioritizes open dialogue to reduce tensions. This mechanism helps countries in the region to voice their interests in international forums, despite challenges in reaching consensus. Lastly, developments in technology and digital trade are increasingly changing the geopolitical face of Southeast Asia. Countries are starting to focus on Digital Transformation to utilize technology for economic growth. Initiatives such as RCEP (Regional Comprehensive Economic Partnership) point to a new direction of economic collaboration, although they also bring challenges for less skilled sectors. These dynamics show that Southeast Asia faces complex and interrelated challenges in the context of global tensions. An inclusive and collaborative approach must be adopted to ensure stability and prosperity for all countries in the region.