Aristotle's "Categories" is a fundamental treatise in which he examines the basic categories and concepts by which things and phenomena in the world can be classified. In the book, the author defines ten main categories to which anything existing can be classified: things that can be bought or sold; objects that have their own owner and are carriers of properties; things of ascending status, etc. Aristotle considers various aspects of the categorization of reality and develops methods for its study. This work is an important contribution to philosophy and logic, laying the groundwork for further developments in these fields of knowledge. Ukrainian title of the book: "Categories".