In this chapter, I analyze the different views that Hilary Putnam developed during the seven decades of his brilliant philosophical career in order to address the question of realism (metaphysical realism, internal realism, quietism, and liberal naturalism). I also argue that the view Putnam defended at the end of his career was the most solid and consistent, and that such view could offer a useful inspiration to the advocates of perspectivism. Keywords Hilary Putnam • Realism • Liberal naturalism • Perspectivism 4.1 Preamble When Michela Massimi invited me to participate in the Edinburgh conference on perspectivism from which this volume derives, she asked me to give a talk about Hilary Putnam's "internal realism" (which was the conception that he defended between 1976 and 1990). Michela's supposition, which she wanted to test, was that "internal realism" can be seen as an early version of perspectivism, and a very interesting one. I agreed with her supposition, but I added that perspectivists should be more interested in "liberal naturalism", the view adopted by Putnam in his last years, since the latter view-granted it preserves the important perspectivist insights of internal realism-was preferable to internal realism for a number of independent reasons. In this chapter, I will develop and defend this interpretation of Putnam's work.