One of the major challenges of public service delivery in sub-Saharan Africa is widespread administrative corruption. This is a considerable challenge given the level of underdevelopment and other societal constraints that have made many vital public services poorly delivered to most citizens. Applying ‘Efficient Grease’, Principal-Agent, and New Public Management theoretical frameworks, and using both quantitative and qualitative data, the book examines the impact of administrative corruption on public service delivery in Nigeria. The book is organised into six chapters. Chapter one is the introduction. Chapter two discourses the conceptual and theoretical frameworks, and reviews the relevant literature. Chapter three explains the research methodology. Chapter four present a historical overview of corruption and service delivery in Nigeria. Chapter five analysed and discussed the quantitative data for the study. Chapter six summarised the major findings and concludes the book. The book would be highly useful to teachers and students of Political Science and Administration, public policy practitioners, development and donor agencies, and the general public.