This is the first collection of essays devoted specifically to the nature and significance of Aristotle's anthropological philosophy, covering the full range of his ethical, metaphysical and biological works. The book is organised into four parts, two of which deal with the metaphysics and biology of human nature and two of which discuss the anthropological foundations and implications of Aristotle's ethico-political works. The essay topics range from human nature and morality to friendship and politics, including original discussion and fresh perspectives on rationalism, the intellect, perception, virtue, the faculty of speech and the differences and similarities between human and non-human animals. Wide-ranging and innovative, the volume will be highly relevant for readers studying Aristotle as well as for anyone working on either ancient or contemporary philosophical anthropology.