The region is at the confluence of international migration from some of the largest labour surplus countries in the world including South Asia, China, Indonesia, the Philippines, Vietnam, and Myanmar since the colonial era. It is a repository of both intra- and inter-regional movements of people now and then. While much of these are economically driven and are labour migrations, mobility and diaspora encompass a contemporary dimension associated with globalisation. The human experience of contemporary migration has evolved into a complex and challenging agenda for research and scholarship. Temporary labour migration throws up issues of risk, precarity, inclusion, and exclusion. The open-endedness of mobility and diaspora challenges us to treat migration as a rupture between the present and the past, as memory and representation, and as location and identity-making.infrastructure and people-to-people connectivity. These ever-evolving forms of regional integration are affecting the interdependence of economic, migration, food, health and environmental security in Southeast Asia. This cluster is broadly inter-disciplinary in outlook and focuses on the ways in which regionalisation and human security are understood and recognized. And the implications for livelihoods, rights, choices and opportunities of communities and individuals across contemporary Southeast Asia.