Migration and security have been widely studied in international relations and political science. Migration is often presented as a threat to national sovereignty, state security as well as to the economic, social and cultural well–being. On security, all of the attention has been on national security, terrorism, extremism and crime. Hence, there is an alternative concept, human security, which emphasizes that the government's responsibility is not only to protect the territorial security and sovereign integrity of the state, but also the freedom and rights of its citizens. Thus, the notion of human security provides an opportunity to broaden our understanding of the economic, social and political challenges associated with migration, from the place of origin to transit, arrival and (re)settlement in a new location. South Asia homes about one-fourth of the world's population, making it both the most populous and the most densely populated geographical region in the world. This region has witnessed mass migration as many of the countries have emerged through the partition. Millions migrated between India and Pakistan and thousands during the formation of Bangladesh, ethnic conflict of Sri Lanka, Maoist Movement in Nepal and ethnic conflict of Bhutan. The book consists of 10 chapters by scholars from India, Nepal and US on different aspects of migration and human security of South Asia such as impact of remittance on livelihood of Dalits of Nepal, illegal migration of Assam and Bangladesh, impact of climate change in migration, rise of anti-immigrant sentiments and internal migration in South Asia.