This study critically examines the evolving manifestations of corruption in Nigeria and their direct contribution to the deepening insecurity across the country. It reveals that corruption has not only persisted since the return to democratic rule in 1999 but has also become intricately linked with various forms of insecurity, including banditry, kidnapping, cybercrime, terrorism, and human trafficking. The study establishes that corrupt practices often perpetuated by individuals in political and bureaucratic positions have emboldened criminal networks and weakened institutional responses to threats. Employing a qualitative content analysis of secondary data, the research identifies significant gaps in governance, accountability, and social inclusion as key enablers of both corruption and insecurity. Findings indicate that insecurity is widespread across Nigeria’s geopolitical zones, with state failure and elite complicity exacerbating the crisis. The study recommends a multidimensional approach to reform, including strengthening institutional capacity, promoting democratic governance, engaging multi-stakeholder participation in national security, and investing in youth empowerment, civic education, and public service delivery. The paper concludes that only through sustained and inclusive efforts to combat corruption can Nigeria begin to reverse its prevailing insecurity and build a more stable and accountable political order.