The coronavirus disease 2019 (COVID-19) pandemic has further emphasised the importance of recognising obesity as a health issue for adults and children, with associated increases in obesity prevalence and risk of severe illness and death from COVID-19. Obesity is highly visible and highly stigmatised. It is frequently regarded as a result of lifestyle choices and behaviours, with a focus on personal responsibility rather than as a complex, multifactorial disease with a strong genetic component. Healthcare professionals, including nurses, have an important role in supporting behaviour changes, and discussing weight with patients in neutral and respectful ways. This article outlines the effects of the COVID-19 pandemic on weight and weight-related behaviours and discusses the complexity of obesity and weight stigma. It also emphasises the importance of nurses advocating for action to address the obesogenic environment.