Conspiracy theories are a popular topic of conversation in everyday life but are often frowned upon when it comes to academic discussions. Looking at the recent spate of philosophical interest in conspiracy theories, The Philosophy of Conspiracy Theories asks whether the assumption that belief in conspiracy theories is typically irrational is well founded.The Philosophy of Conspiracy Theories is aimed at both the philosopher and the non-philosopher. The book is a qualified defence of belief in conspiracy theories, presenting the argument that belief in particular conspiracy theories can be rational. It covers such issues as: who might be consider a qualified conspiracy theorist; how do we analyse claims of disinformation; is our reliance on official theories a good reason to be suspicious of rival conspiracy theories; and what we should do when official theories and conspiracy theories are in conflict?