This anthology contains the principal texts of the sceptical tradition from its origins in antiquity to contemporary philosophy. Selections include the writings of both well-known and lesser-known but influential philosophers of the Western tradition who either advanced sceptical views or dealt with sceptical issues for other philosophical or religious purposes. An introduction on the origins, kinds, and significance of philosophical scepticism puts the various readings in the context of the history of Western philosophy. The editors have also added brief discussions of each philosopher and text included in the anthology, plus a selected bibliography, which lists the main secondary literature on ancient, modern, and contemporary scepticism. This collection is ideal for introductory philosophy courses and courses on intellectual history, or for any reader interested in an influential school of thought, which challenges the nature of philosophy itself.