Bullying is a widespread phenomenon in school communities. Although there are significant differences in prevalence between schools, regions and countries. Bullying is a complex problem that is related to several individual, family, school level and social factors. The data was collected in the last survey (in 2013/2014) of the Health Behaviour in School Aged Children Study (HBSC) that is a WHO coordinated nationally representative study. 4 types of bullying involvement was determined: bully, victim, bully-victim and not involved. The ratio of these types was analysed related to the variables of family affluence, school type and type of school administration (state, religious or other) There are no significant differences in the ratio of bullying involvement according to the school type, but there are significant differences according to type of school administration or cathegories of family affluence. Although social-cultural differences doesn’t seem to be key factors of bullying they might have stong contribution to its understanding and designing effective prevention programs.