By 2017, it was estimated that over 40 million people were displaced within their own countries by conflict and violence across at least 56 countries worldwide. Solutions to the epidemic of forced internal displacement are frequently premised on the return of internally displaced persons (IDPs). Indeed, as a characteristic need of IDPs, such returns benefit from a special protection framework developed by IDP protection instruments such as the Guiding Principles. However, the legal status of those instruments remains ambiguous, generating attendant questions about the congruity of the IDP return framework with existing international law. Moreover, limited knowledge exists on its practical implementation. As a result, both inter-national agencies and individual scholars have repeatedly issued urgent calls for comprehensive and grounded theoretical investigation into this topic. This book answers those long-standing calls for research by presenting a detailed study of the return of conflict-afffected IDPs under international law.