We are delighted to introduce The Proceedings of the International Conference on Environmental Science and Sustainable Development in 2019. This conference has taken place with the theme “The Strengthening of Sustainable Development Goals (SDGs) in Southeast Asia”. Environmental problems are dynamics and complex that needs the analytical and decision making instruments which can accommodate these characteristics. Environmental science is an interdisciplinary science that delivered to understand complex and dynamic interactions in environmental systems. Studies in Environmental Sciences involves various fields of science which enable the formulation of efforts to solve environmental problems in a holistic and comprehensive way for its sustainability. Sustainable development is a dynamic process in environmental science that includes the process of utilizing natural resources, the direction of investment, the orientation of technological development and institutional change to address the environmental problems. The conference brought together a number of environmental experts from various disciplines, as well as practitioners, students and lecturers. Meanwhile, with a total of 38 papers, then all papers in this proceeding are divided into several sub-topics, i.e.: Ecosystem And Biodiversity Conservation; Environmental Planning And Management; Water And Waste Management; Governance, Culture, and Politics; Sustainable Energy And Renewable Energy; Spatial Planning And Regional Analysis; Community Engagement; Social Movement And Environmental; and Strengthening Of Sustainable Development Goals. We hope that the valuable work and discussion during this proceedings will lead to the initiatives and innovations in getting the Strengthening sustainable development goals, especially in solving environmental problems.