<![CDATA[Bullying is one of the most common problems in schools and has negative impacts on students' social, emotional, and academic development. Addressing bullying perpetrators is essential to prevent repeated bullying behavior. Group counseling based on Cognitive Behavioral Therapy is considered an effective intervention because it helps students identify and modify irrational thoughts that lead to aggressive behavior. This study aimed to determine the effectiveness of group counseling using the cognitive behavioral therapy approach in reducing bullying behavior among student perpetrators at SMKN 1 Trowulan. This study employed a quantitative approach using a one-group pretest posttest Design. The participants consisted of eight students selected through purposive sampling. Data were collected using a validated and reliable bullying behavior questionnaire and analyzed using the Wilcoxon Signed-Rank Test with SPSS. The findings showed that bullying behavior decreased after the implementation of group counseling using the cognitive behavioral therapy approach. The Wilcoxon Signed Rank Test yielded an Asymp. Sig. (2-tailed) value of 0.012 (p < 0.05), indicating a significant difference between the pretest and posttest scores. Group counseling based on the Cognitive Behavioral Therapy approach was effective in reducing bullying behavior among student perpetrators at SMKN 3 Jombang. Therefore, this intervention can be used as an alternative counseling service to reduce bullying behavior in schools.]]>
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