This study was motivated by the persistence of bullying behavior in schools, which may negatively affect students' social and psychological development. One factor believed to influence such behavior is self-concept. This study aimed to determine the level of students’ self-concept, the level of bullying behavior tendencies, and the influence of self-concept on bullying behavior tendencies among twelfth-grade students at SMA Negeri 12 Kota Jambi. The study employed a quantitative approach using an ex post facto method. The sample consisted of 119 students selected through a simple random sampling technique from a population of 169 students. Data were collected through questionnaires and analyzed using statistical techniques. The results showed that most students possessed a high level of self-concept, while the tendency toward bullying behavior was categorized as low. Furthermore, the findings indicated that self-concept had a significant influence on students' bullying behavior tendencies. Students with a more positive self-concept were less likely to engage in bullying behavior. These findings highlight the importance of developing a positive self-concept as one of the preventive efforts to reduce bullying behavior in the school environment. Keywords: Self concept, Bullying, Students
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