Weight bias is pervasive, impacting the lived experiences of individuals with large bodies in all areas of society. Weight bias negatively impacts psychological and physical health, and contributes to systemic inequity for individuals with large bodies. Given that counselling psychology has been recognised for its commitment to social justice, it is important to provide examples of the many social justice issues associated with weight bias. The purpose of this article is to position weight bias as an important social justice issue for psychologists, through the lens of 3 social justice perspectives; distributive justice, procedural justice, and ecological justice. We examine the lack of equitable distribution of opportunities and resources for individuals with large bodies in health care, the workforce, education, and within interpersonal relationships. We also discuss the lack of voice provided to individuals with large bodies with regard to the policies and practices that affect them, and the social and environmental forces that systemically influence body weight and weight bias. Finally, we encourage further dialogue between professionals across disciplines about weight bias as a social justice issue in the future design of research, education, and practice.