This Element outlines Wittgenstein''s early and later philosophies of logic, and explains Wittgenstein''s views regarding the methodological significance of logic for philosophy. Wittgenstein''s early philosophy of logic is presented as a further development of Frege''s and Russell''s accounts of logic, and Wittgenstein later philosophy as a response to problems with his early views, including confusions about idealization and abstraction in logic. The later Wittgenstein''s novel logical methods, such as the method of language-games, are outlined, and the new kind of logical naturalism developed in his later philosophy described. I conclude by discussing the later Wittgenstein on names.
