Immanuel Kant's Critique of Pure Reason is one of the most rewarding and difficult of all philosophical works. Norman Kemp Smith's translation is immensely valuable, not simply because he rendered Kant's language into readable English, but also because his own extensive understanding of the Critique made him acutely aware of the pitfalls of translation. This text is that of the second edition of 1787, with an additional translation of all first edition passages which in the second edition were either altered or omitted. For this reissue of Norman Kemp Smith's classic 1929 edition, Howard Caygill has contributed a new Preface, setting this translation into the context both of Kemp Smith's own life and work, and of his influence on Kant scholarship.