Introduction. History of Policing. Definition of Police. Objectives and Importance of Policing. Police and the Law. Perspectives on the Functions of the Police. The Concept of Law and Law Enforcement Agencies. Policing and Law Enforcement. Historicising Policing in Nigeria. Stateless Communities. Centralized Communities. The Colonial Era. Native Authority Police. The Amalgamation. Post-Colonial Policing in Nigeria, 1960- 1966. Nigeria's Law Enforcement Agencies in Modern Times. Problems and Obstacles to Effective Policing in Nigeria. Community Policing in Nigeria. Self-Policing and Community Policing in Nigeria. The Self-Policing Model Conclusion.