This History of Western Philosophy naturally delves into the origins of philosophy, passes through the main phases considered classic in the history of philosophy, until it reaches the contemporary era, which occupies the largest extension of this exposition. Thus, we have the following groupings of chapters: (I) The first four chapters cover the following periods: (1) Philosophy in Classical Antiquity; (2) Philosophy in the Middle Ages; (3) Renaissance Philosophy and Modern Rationalism; (4) Philosophy of British Empiricism and Kant’s Critical Philosophy. (II) The fifth chapter (5), dedicated to Philosophy in the Nineteenth Century, can be considered a "divider" between the "more historical" grouping of the first four chapters and the "more contemporary" grouping of the chapters dedicated to Philosophy of the Twentieth Century. (III) The third grouping is dedicated to Contemporary Philosophy, with the following sequence: (6) From the Origins of Analytic Philosophy to Anglophone Philosophy of the mid-twentieth century; (7) "Continental" philosophy in the first half of the twentieth century; (8) "Continental" philosophy in the second half of the twentieth century; (9) Anglophone philosophy in the second half of the twentieth century. (IV) The tenth chapter (10) is dedicated to addressing some of the main issues and orientations of the main areas of Contemporary Philosophy, namely the following: Metaphysics and Ontology, Philosophy of Science, Philosophy of Physics, Philosophy of Biology, Philosophy of Mind, and Ethics.