The focus of this special issue of Theoria is the Politics of Migration. Our aim in designing and attracting contributions to this issue was to contribute to the current debates on various aspects of global migration practices that are challenging the ways in which many nation-states, sending and receiving migrants, conceive of their place in this ever-changing globalised and globalising world in which we all live. International Relations theorists have, for several years, been writing about the contesting phenomena of integration and disintegration in global politics. As the world becomes more globalised, more linked and interdependent, the reality of a kind of global citizenship for the privileged elite with access to the markets and their spoils become more apparent. Those on the other end of the spectrum, often immigrant, minority and working class groupings who do not have access to resources beyond those promised to them by the state they rely on, react against these globalising forces. The result is a contest between a global integration and pulling together of individuals all over the world with similar political and economic situations, and a disintegration within and between nation-states, where those without these networks retreat into ethnic and cultural enclaves that offer them protection and defence against globalising impulses.