Conspiracy theorizing (or what Richard Hofstadter famously called the paranoid style) is an enduring part of American politics. For such a common feature of the political landscape, there is little consensus on why conspiratorial beliefs blossom. This is not for want of attention; large literatures have addressed the phenomenon. For example, some argue that the causes of conspiracy theories are psychological, stemming from cognitive quirks, authoritarian personality traits, or psychopathologies. Sociological arguments contend that group dynamics and social status drive conspiracy theorizing. Political scientists argue that institutional power (or lack thereof) drives people to adopt conspiracy theories. Philosophers, on the other hand, argue that conspiracy theories gain traction because of their unique epistemological features, which allow beliefs to prosper without standards of evidence. Each of these views provides valuable insights. Conspiracy Theories brings together these perspectives for students to evaluate their strengths. While engaging in rich discussion, Conspiracy Theories rigorously analyzes the most current arguments and evidence while providing numerous real-world examples so students can contextualize and visualize the current debates. Each chapter addresses important current questions, provides conceptual tools, defines important terms, and introduces the appropriate methods of analysis. Each chapter concludes with a list of important terms, questions to spark class discussion, and suggestions for further reading. The chapters will have boxed text to highlight important points with anecdotes and quotes.