We conducted an audit of secondary schools in southwest England to determine if/how they mention weight-related bullying in their policies, and whether this differs by school-level factors. We obtained lists of all secondary mainstream state, private, and special schools in seven local authorities and downloaded anti-bullying policies from their websites. Policies were searched for key words related to weight and size. We also recorded whether policies mentioned appearance or other key targets for bullying, such as race, religion, sexuality etc. We obtained school level data including size, gender mix, academic performance and quality ratings. From 255 schools with an available bullying or behaviour policy, only 6.7% specifically mentioned weight-related bullying. Just under half (48.6%) mentioned bullying in relation to appearance. Bullying was most often mentioned in relation to race/ethnicity (94.5%), sexual orientation (93.3%), gender (85.9%), religion (84.9%) or gender identity (67.5%). Private schools (N = 40) were more likely to mention weight-related bullying (17.5%) than mainstream state schools (N = 148, 6.1%). No special schools, whether state (N = 41) or private (N = 26), mentioned weight-related bullying in their policies. There was no strong evidence that other school characteristics made a difference, but small numbers limited statistical power of these comparisons. There is a significant mismatch between the prevalence of weight-related bullying in schools and its representation within school anti-bullying policies. Some types of school are more likely than others to mention weight-related bullying in their policies. We recommend that schools explicitly recognise weight-related bullying in their anti-bullying policies and explore how to support staff and pupils to take action.