Background: Childhood obesity and school bullying are pervasive public health issues and known to cooccur in adolescents. However, the association between underweight or thinness and chronic bullying victimization is unclear. The current study examined whether chronic bullying victimization is associated with weight status and body self-image. Methods: A school-based, cross-sectional study in 39 North American and European countries and regions was conducted. A total of 213,595 adolescents aged 11, 13, and 15 years were surveyed in 2009/10. Chronic bullying victimization was identified using the Revised Olweus Bully/Victim Questionnaire. Weight status was determined using self-reported height and weight and the body mass index (BMI), and body self-image was based on perceived weight. We tested associations between underweight and bullying victimization using three-level logistic regression models. Results: Of the 213,595 adolescents investigated, 11.28% adolescents reported chronic bullying victimization, 14.80% were classified as overweight/obese according to age-and sex-specific BMI criteria, 12.97% were underweight, and 28.36% considered themselves a little bit fat or too fat, 14.57% were too thin. Bullying victimization was less common in older adolescent boys and girls. Weight status was associated with chronic bullying victimization (adjusted OR underweight =1.10, 95% CI= 1.05-1.16, p=0.002; adjusted OR overweight =1.40, 95% CI= 1.32-1.49, p<0.0001; adjusted OR obese =1.91, 95% CI=1.71-2.14, p<0.0001). Body self-image also related to chronic bullying victimization (adjusted OR too thin =1.42 , 95% CI= 1.36-1.49, p<0.0001; adjusted OR a little bit fat =1.54, 95% CI=1.48-1.61, p<0.0001; adjusted OR too fat =3.30, 95% CI=2.96-3.68, p<0.0001). Conclusions: Both perceived weight and self-rated overweight are associated with chronic bullying victimization. Both overweight and underweight children are at risk of being chronically bullied.