The Logic of Estrangement conceives of estrangement as an irrational or unreasonable embodiment of reason in the social world, rather than as a self-alienation of the human essence, its more usual characterization. It undertakes a unified historical and systematic investigation of the idea of estrangement and its significance for the social role of philosophy and critical theory. It traces the development of the idea in major works of Kant, Hegel, and Marx, and it explores the idea's significance for a critical understanding of John Rawls's political philosophy. In so doing it provides a way of understanding Kant and Rawls as part of a tradition they are not usually associated with, and it thereby offers new insight into their thought. It also puts forward a generalized reconstruction of the idea of estrangement, using concepts from game theory and decision theory. This analysis enables an extension of the idea to applications beyond its usual domain as well as a deeper understanding of the works of the above philosophers.