Bullying poses ongoing challenges to student safety and well-being in schools, yet many instruments, such as the Centers for Disease Control and Prevention’s Youth Risk Behavior Survey, do not address bystander behavior. This study examined how 3,717 middle and high school students in 14 schools in the western United States respond when witnessing bullying and what factors influence their responses. Findings suggest that friendship with the target significantly increased both defending behaviors and the likelihood that bullying stopped or decreased. Gender influenced responses, with female students more likely to report and male students more likely to fight back. Racial alignment between bystander and target predicted higher reporting rates and intervention success, raising concerns about in-group favoritism. Physical bullying prompted more intervention than verbal and relational bullying, though verbal bullying was more prevalent. Findings underscore the need for culturally responsive, relationship-focused interventions to strengthen bystander engagement across contexts.
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