The physiotherapy profession increasingly considers weight management to be part of its scope of practice. Ostensibly this may seem like a good idea: popular media and biomedical discourses highlight a global "obesity epidemic", and physiotherapists, considered "experts in movement", may be well placed to help address obesity by encouraging activity. On the other hand, an excessive focus on weight can have negative consequences. A large body of research now highlights negative attitudes towards those who are overweight (weight stigma) among health professionals, including doctors, nurses, dieticians, psychologists and exercise scientists. Yet, despite the size and impact of the profession, there has been little work exploring weight stigma in the context of physiotherapy.My aims are two-fold. First, I investigate weight-related interactions in physiotherapy, and second, I investigate how weight might be (re)thought in this context. The first three thesis chapters provide a theoretical exploration of concepts relevant to weight in physiotherapy. In the introductory chapter I argue that it is helpful to draw from scholarship in critical psychology and the emerging field of critical physiotherapy. In Chapter 2 I consider traditional social psychological theories that provide a social and embodied understanding of weight stigma. However, I outline how these theories are notably apolitical, acultural, ahistorical and lack mechanisms for understanding power in stigma. To address this issue, I introduce post-structuralist perspectives (particularly those of Michel Foucault) that are often used in critical social science. Using a poststructural psychological lens, I critically examine the literature on weight and its associated stigma.As context specific understandings are desirable, I use Chapter 3 to examine the nature of the physiotherapy profession, to determine what might be relevant to "thinking weight" and considerations of stigma. Here I look in depth at this profession, discussing where power, the body, reflexivity and the profession's ontological underpinnings might be relevant to weight-related physiotherapy interactions.In Chapter 4 I outline the empirical approaches I took to further address the aims of the thesis, and discuss their underlying assumptions. Following this, in Chapters 5 to 7 I present three empirical studies, each of which is published in peer-reviewed journals (or under review). In a previous study (described in Chapter 3) I tested weight stigma in physiotherapists using attitude tests in an online survey. I found that participating physiotherapists held explicit and implicit weight stigmatising attitudes similar to those in related professions. Building on this earlier work, Iconducted an inductive thematic analysis of interviews with patients who had experienced weightrelated interactions with physiotherapists (described in Chapter 5). Participants spoke of perceiving weight stigma in a number of elements of physiotherapy interactions, elements of the physiotherapy environment and...