The prevalence and consequences of school bullying have been widely reported in the literature. Likewise, it has been shown that this is multi-cause violence and, therefore, different aspects need to be considered for its prevention and containment, including the positive school climate. In this context, the present study proposes to investigate the phenomenon of bullying in high school and its association with the school climate and its dimensions (student-student relationships, teacher/student relationships, school safety, respect for diversity, clarity of expectations, and fairness of rules). The participants were 388 students from two public institutions in the northwest of Paraná state, who answered a questionnaire about the school climate and another about bullying victimization in 2019. This study is descriptive and relational. We analyzed the data using descriptive statistics and multiple linear regression. The results predominantly indicated a positive school climate in the institutions, although we have founded evidence of bullying victimization. Regression analysis identified a significant relationship between the dimensions of the school climate, especially "student-student relationships" and "clarity of expectations," and the occurrence of bullying. Thus, we underscored the significance of fostering a positive school climate to cultivate healthy, violence-free relationships, nurture empathy among peers, and ensure clarity in institutional norms.