This book is an effort by a Professor with more than three decades of experience in teaching of law, and his younger colleague with a combination of teaching and practice of law, to put on record key issues in Nigerian Constitutional Law. The book is rich with updated information, especially with recent judicial authorities. It is divided into sixteen unequal chapters as follows: Introduction, Constitutional Law concepts, Legal Regime of Amalgamation in Nigeria (1900-1999), Principles of Constitutional Interpretation in Nigeria, Fundamental Objectives and Directive Principles of State Policy, Fundamental Rights, the Judiciary, the Executive, the Legislature, Citizenship, Judicial Interpretation of the Principle of locus standi in Nigeria, Access to Information as a Fundamental Right, Freedom of Information and National Security in Nigeria, Presidential Powers and State of Emergency in Nigeria and Challenges of the use of State of Emergency in Democratic Governance: Plateau and Ekiti Experiences. It is written in simple English Language, making it easy for readers to comprehend. This book is of immense value to students, teachers, legal practitioners, judges and policy makers.