In recent years, climate change has become a major threat not only to international peace and security but is also a multiplier of instability in some of the most volatile regions of the world. To some extent, South Asia is the most vulnerable and disaster prone regions in the world especially with regard to water related disasters and its poor disaster management capacity. The absence of any river basin management mechanism in the region is the cause of potential hydro-conflict in South Asia. South Asia is ill prepared to manage the disasters in both at national and regional level. To explain and highlight on this emerging threat, Center for South Asian Studies (CSAS) has published a book titled Regional Environmental Issues: Water and Disaster Management. Major General A N. M Muniruzzaman, ndc, psc (Retd.), BIPSS, President has contributed a chapter in this book titled Climate Change and Regional Security: Water and Disaster Management in South Asia.