This study examines the impact of Boko Haram’s insurgency on cross-border migration dynamics in north-eastern Nigeria, a region characterized by porous borders and long-established transnational social, economic, and cultural ties. The research highlights how weak border controls and informal migration routes have inadvertently facilitated the movement of fighters, weapons, and supplies, thereby strengthening the operational capacity and territorial reach of the insurgent group. Boko Haram’s activities have significantly intensified insecurity, leading to widespread displacement, the breakdown of livelihoods, and increased flows of refugees and internally displaced persons into neighboring countries. These conditions have deepened an already severe humanitarian crisis and created environments vulnerable to radicalization, especially among displaced youth and marginalized populations. The study argues that addressing the intersection of terrorism and cross-border migration requires a holistic and coordinated response. Such a response should integrate enhanced border governance, intelligence-driven security cooperation, targeted humanitarian interventions, and inclusive long-term development strategies. By tackling both immediate security threats and the underlying socio-economic drivers of forced migration, sustainable peace and regional stability can be more effectively promoted.