This textbook offers a clear, systematic, and practical exposition of Nigerian criminal procedure and practice. It examines the full trajectory of criminal proceedings—from arrest, investigation, and arraignment to trial, sentencing, and appeals—while integrating statutory provisions, judicial authorities, and procedural rules applicable across Nigerian courts. Emphasis is placed on practical courtroom experience, the protection of constitutional rights, and the roles of key actors in the criminal justice system. Written in a concise and accessible style, the book is designed to serve as a reliable guide for law students, legal practitioners, and judicial officers seeking a firm understanding of criminal litigation in Nigeria.