Deleuze was one of the most prominent philosophers of the 20 century and a figure whose ideas are increasingly influential throughout the humanities and social sciences. His work, particularly his collaborations with psychoanalyst Guattari, focused on the articulation of a philosophy of difference. Rejecting mainstream continental philosophy just as much as the orthodox analytical metaphysics of the English-speaking world, Deleuze proposed a positive and passionate alternative, bursting at the seams with new concepts and new transformations. This book overviews the philosophical contribution of Deleuze including the project he developed with Guattari. It goes on to explore the application of these ideas in three major dimensions of psychology: its unit of analysis, its method and its applications to the clinic. Deleuze and Psychology will be of interest to students and scholars of psychology and those interested in continental philosophy, as well as psychological practitioners and therapists.