Naturalism is an approach to philosophical problems that interprets them as tractable through the methods of the empirical sciences or at least, without a distinctively a priori project of theorizing. For much of the history of philosophy it has been widely held that philosophy involved a distinctive method, and could achieve knowledge distinct from that attained by the special sciences. Thus, metaphysics and epistemology have often jointly occupied a position of “first philosophy,” laying the necessary grounds for the understanding of reality and the justification of knowledge claims. Naturalism rejects philosophy’s claim to that special status. Whether in epistemology, ethics, philosophy of mind, philosophy of language, or other areas, naturalism seeks to show that philosophical problems as traditionally conceived are ill-formulated and can be solved or displaced by appropriately naturalistic methods. Naturalism often assigns a key role to the methods and results of the empirical sciences, and sometimes aspires to reductionism and physicalism. However, there are many versions of naturalism and some are explicitly non-scientistic. What they share is a repudiation of the view of philosophy as exclusively a priori theorizing concerned with a distinctively philosophical set of questions.