This study examined bystander behaviors in response to bullying across Italian and Singaporean students. It hypothesized that positive attitudes towards victims and perceived peer pressure for intervention would correlate with defending behaviors, while negative attitudes would correlate with passive behaviors. The study found defending behaviors were positively associated with anti-bullying attitudes and peer pressure for intervention in both countries. Attitudes were a stronger predictor of behaviors for Italian students, while peer pressure better predicted behaviors for Singaporean students. Younger students and males from Italy were more likely to defend. The findings suggest bystander responses are influenced by attitudes, peer norms, and may differ cross-culturally.