This volume provides a comprehensive and up-to-date analysis of the source and scope of international law on migration. It explores international norms on state authority to regulate migration, freedom of movement, forced migration, human rights, family unification, trafficking and smuggling of migrants, national security, rescue at sea, health, development, integration, and nationality. Migration and International Legal Norms shows that, despite the absence of a comprehensive legal instrument governing international migration, there is a wide range of legal norms relevant to migration embodied in multilateral treaties and conventions, regional agreements, and customary international law. It also identifies some significant gaps in international law, recommending areas for further cooperative efforts. This volume will be of interest to scholars and policy-makers, and to all those interested in how the community of nations is responding to the increasingly significant phenomenon of international migration.