This book explores the challenges of sustainable development in Southeast Asia, particularly in light of economic, social, and environmental crises. It analyzes how regional countries have responded to issues such as economic instability, ecological degradation, population growth, and social inequality. Content highlights: Economic Dimensions – impacts of financial crises, development strategies, and the need for balanced growth; Environmental Concerns – deforestation, pollution, and resource depletion, with calls for stronger ecological management; Social and Political Issues – poverty reduction, education, health, governance, and the role of institutions in shaping sustainable policies; Regional Cooperation – the importance of ASEAN and international partnerships in addressing cross-border challenges; Lessons for the Future – recommendations for integrating sustainability into policymaking, strengthening resilience, and pursuing development that balances growth with environmental and social responsibility.