Research on principals' perceptions and responses to school bullying is scarce. This study investigated the perceptions of seven middle school principals and their responses to six hypothetical vignettes depicting incidents of physical, verbal, or relational bullying. During interviews, respondents were asked to rate the seriousness of each incident and describe how they would respond. Respondents rated all the incidents, regardless of the form of bullying, as moderately serious, serious, or very serious. When asked to describe how they would respond to incidents, all responded they would take action (e.g., consequences for the instigator, interventions to change the behavior of the instigator, support for the target). State statute on bullying, school anti-bullying policies, past experience with bullying, and a belief that students deserve to feel safe were key to guiding their responses. The principals recognized that bullying occurred on their campuses but indicated that incidents were minimized as a result of their strong school anti-bullying polices and a belief that no form of bullying was to be tolerated on their campuses.