The Social Psychology of Gullibility: Conspiracy Theories, Fake News and Irrational Beliefs explores what we know about the causes, functions, and consequences of gullibility, and the social psychological processes that promote or inhibit it. With contributions from leading international researchers, the book delves into how human judgments and decisions can be distorted and undermined. It discusses the nature and functions of gullibility, the role of cognitive processes in gullibility, the influence of emotion and motivation on gullibility, and social and cultural aspects of gullibility. Underpinned by a wealth of empirical research, contributors explore captivating issues such as the psychology of conspiracy theories, the role of political gullibility, gullibility in science, the role of the internet in fostering gullibility, and the failures of reasoning that contribute to human credulity. Essential reading for researchers, social science students, professionals, and practitioners interested in understanding human credulity and its role in contemporary public affairs.