In the third edition of his well-loved textbook, Stephen Holland shows how philosophy is key to evaluating the suitability of public health interventions. Holland explores the key goals of public health ethics in relation to both moral and political philosophy, reflecting on our everyday intuitions about which public health policies are justified. In light of recent developments, he includes new content exploring equity and health inequalities, and on how public health information is gathered and used. The book is updated throughout with material on contemporary cases, such as the COVID-19 pandemic.