South Asia is a geo-political system which has its unique security characters. The emerging complex nature of a system could lead either to the security or insecurity of that system. India and Pakistan are the emerging nuclear powers of South Asia. The nuclear doctrines and behavior of India and Pakistan promote the advancement of their nuclear programs in both strategic and civil domains. Both countries desire stability, the balance of power and security through the possession of nuclear options. However, the author argues that South Asia’s existing nuclear environment and its emerging complexity have produced insecurity and instability in the region at large. This paper is an attempt to identify the complexity of actors and behaviors and their emerging threats to the security of the region. There is also a lack of literature to portray the nuclear risk that the non-nuclear states face in South Asia. This paper tries to fill that gap as well.