Hegel's Encyclopaedia Logic constitutes the foundation of the system of philosophy presented in his Encyclopaedia of the Philosophical Sciences. Together with his Science of Logic, it contains the most explicit formulation of his enduringly influential dialectical method and of the categorical system underlying his thought. It offers a more compact presentation of his dialectical method than is found elsewhere, and also incorporates changes that he would have made to the second edition of the Science of Logic if he had lived to do so. This volume presents it in a new translation with a helpful introduction and notes. It will be a valuable reference work for scholars and students of Hegel and German idealism, as well as for those who are interested in the post-Hegelian character of contemporary philosophy.