People are undoubtedly on the move, when one out of every 33 people in the world is an international migrant. Concurrently, nation-states are attempting to curb migration for security reasons. International migration is perceived, in some eyes, as an existential security threat in the post-Cold War era. This Handbook provides a state-of-the-art analysis of the critically important links between migration and security in a globalising world. The Handbook presents original contributions suggesting innovative and emerging frontiers in the study of the securitization of migration. Experts from different fields reflect on their respective conceptualisations of the migration-security nexus, and consider how an interdisciplinary and multifaceted dialogue can stimulate and enrich our understanding of the securitization of migration in the contemporary world. This Handbook will aid students of migration studies to understand the comparative policies in creating and reproducing the migration-security nexus, and offer scholars and practitioners in migration studies a comprehensive understanding of a multitude of aspects of the securitization of migration. It will also appeal to academics, specialists and practitioners in the field of security studies who are keen to learn how migration has become securitized.