This work comprehensively analyzes intra-ASEAN migration dynamics, examining its historical evolution, key drivers, and multifaceted impact on economic income inequality within sending and receiving countries. The analysis highlights the significant scale of human mobility within Southeast Asia, driven primarily by substantial economic disparities and labor market demands, alongside the enabling role of porous borders and, increasingly, environmental factors. While remittances from migrant workers demonstrably contribute to poverty reduction in origin countries, their effect on overall income inequality is more nuanced. In destination countries, migrant labor fuels economic growth by filling critical shortages. Yet, it can also contribute to wage compression for low-skilled native workers and strain public services, potentially exacerbating existing inequalities. The report critically assesses current national and regional policy initiatives, including ASEAN declarations and bilateral labor agreements, identifying their limitations, particularly their non-binding nature and challenges in enforcement. It concludes by offering strategic recommendations aimed at enhancing regional cooperation, strengthening migrant worker protection, leveraging migration for inclusive economic development, and proactively addressing climate-induced displacement, advocating for more robust and legally binding frameworks to ensure safe, orderly, and mutually beneficial migration across the ASEAN community.