The study assessed the impact of insecurity on the level of foreign direct investment in Nigeria. Over the last few years, the rising wave of insecurity in the country has tended to undermine the economic growth performance through its foreign direct investment channel. This resulted in unemployment and poverty, exacerbating the already strained security concerns. The research used the ARDL model using data spanning the years 2000 to 2023. The study indicated that insecurity adversely impacted FDI growth in Nigeria in both the short and long term. The research further revealed that gross domestic product, as a control variable, positively influenced foreign direct investment. The report advised that the government should develop policies and programs aimed at tackling the fundamental causes of insecurity, including ethnoreligious strife, institutional and political corruption, and a deficient security apparatus in Nigeria. The government should adopt a proactive approach to address security issues and threats by implementing training, utilising modern intelligence gathering and sharing techniques, enhancing logistics, and deploying advanced technology to manage security challenges, thereby mitigating persistent bombings, robberies, kidnappings, and violent crimes perpetrated by criminals.