Mainstream theories on international relations have largely evaded engagement with the concept of Sovereignty, which is fundamental to the discipline. Critical approaches such as "constructivism" appear to make headway into thinking about Sovereignty, not only in the west but also in south Asia, where theorising is sorely needed. With the approach's engagements with Sovereignty revealing contingent and relativist features as well as sounder ontological foundations of the concept, constructivism is better placed to theorise issues related to domestic and regional politics in south Asia.