International Migration Law provides a detailed and comprehensive overview of the international legal framework applicable to the movement of persons across borders. The role of international law in this field is complex, and often ambiguous: there is no single source for the international law governing migration. The current framework is scattered throughout a wide array of rules belonging to numerous fields of international law, including refugee law, human rights law, humanitarian law, labour law, trade law, maritime law, criminal law, and consular law. This textbook therefore cuts through this complexity by clearly demonstrating what the current international law is, and assessing how it operates. The book offers a unique and comprehensive mapping of this growing field of international law. It brings together and critically analyses the disparate conventional, customary, and soft law on a broad variety of issues, such as irregular migration, human trafficking, refugee protection, labour migration, non-discrimination, regional free movement schemes, and global migration governance. It also offers a particular focus on important groups of migrants, namely migrant workers, refugees, and smuggled migrants. It maps the current status of the law governing their movement, providing a thorough critical analysis of the various stands of international law which apply to them, suggesting how the law may continue to develop in the future. This book provides the perfect introduction to all aspects of migration and international law.