The essay begins with a history of the term pluralism, the philosophical uses of which owe much to William James. Following Jean Wahl and others, we can distinguish various senses of the term in James’s writings, including the metaphysical theses that human action is not fully determined, and that the world contains a multiplicity of unique entities that cannot be fully described in concepts. On the epistemological front, James embraces scheme pluralism, the view that there are many correct schemes for (...) describing the universe. According to James’s vertical scheme pluralism, there are different non-rival schemes, for example those of mathematics, ethics, and the consular service. According to his horizontal scheme pluralism there can be more than one correct account of how things are in any given domain. James also embraces ethical pluralism, the thesis that there are different reasonable or valid systems of values, and point of view pluralism, that claim that there are many legitimate but—at least in some cases—incommensurable points of view on the universe. James is particularly interested in the cases of human/human, human/animal, and human/higher consciousness points of view. The essay traces the development of James’s views about pluralism from the early eighteen eighties onward, including the essays collected in The Will to Believe (1897), his lecture “On a Certain Blindness in Human Beings” (1899) Pragmatism (1907), and from the last years of his life, A Pluralistic Universe (1909), “A Pluralistic Mystic” (1910), Some Problems of Philosophy (1911). It concludes with a brief discussion of contemporary pluralism in the work of Nelson Goodman, Hilary Putnam, and others. (shrink)