Grschool, in Flemish secondary schools. Methods: We use data from the Flemish Educational Assessment (FlEA), consisting of 11,872 students in 85 schools. Multivariate analyses of variance (ANOVA) were performed. Results: Non-involved students felt most attached to peers, parents, teachers, and school. Bullies matched the level of parental attachment of the non-involved, and are even more popular among peers. Victims are especially unsuccessful among peers. Bully/victims felt least attached to peers, parents and school, and least supported by teachers. Discussion: Bullies appear to be popular among peers. Victims and bully/victims lack a number of important sources of support. Translation to Health Education Practice: The results of this study endorse peer-group level intervention initiatives. Furthermore, we support whole-school approaches that include all actors--including pupils, parents, and teachers--in combating bullying. (Contains 2 tables.)