Security is critical to stability and development of any nation. In response to multifaceted security challenges besetting Nigeria, the Federagovernment created Nigeria Security and Civil Defence Corps (NSCDC) multifaceted security challenges besetting Nigeria, the Federal government created Nigeria Security and Civil Defence Corps (NSCDC) to compliment the roles of Nigeria Police Force (NPF). Instead of synergy and cooperation, the relationship between the agencies has been characterized by rivalry and has created gaps that criminals are taking advantage of. The study assessed the causative factors and the implications of the conflicts in Lagos Metropolis. The study adopted descriptive research design but relied onqualitative data. The study found that the rivalry between the two agencies is partly due to weak operational guideline, greed and inferiority/superiority complex while none of the of?cers involved in previous conflicts were punished. The study recommended that offcers of the NSCDC and NPF who aids or abets conflict should be decisively punished to serve as deterrent to thers. In addition, there should be clear operational guidelines to minimize rivalry while Inter-Agency con?ict resolution mechanism to promote cooperation and collaboration rather than antagonism is further recommended.