This book contributes towards the discussion of PSO innovation through theoretically informed empirical studies of innovation across a range of theories, topics and fields. Studies examine the role of citizens, managers, and public service organizations; the adoption, diffusion, implementation, and management of innovations; collaboration, communication, and information technologies; and decision-making, ethical principles, HR management, leadership, and procurement. The studies – which examine the situation in a range of countries in Europe and Asia – cover a range of different organizations such as non-profits, health service organizations, and local governments. This book was originally published as a special issue of Public Management Review.