Public health is a particular area of medical practice that raises a series of philosophical issues that require urgent discussion. The philosophy of public health includes metaphysical questions such as, what do we mean by 'public' in public health? How ought we to conceptualise the idea of 'populations'? Are they merely aggregations of individuals? It also includes epistemological questions such as, what methods are most appropriate for thinking about public health? How do empirical and normative issues relate to each other? Controversial ethical, political and social issues, including those relating to vaccinations, the threat of pandemics and possible restrictions to individual liberties, public health research, screening and obesity policy should also be considered. This volume includes a diverse set of papers exploring a number of the most important theoretical and practical issues that arise across the whole field of the philosophy of public health.