Bullying is an act of hurting another person physically, verbally, relationally and cyber bullying that is carried out repeatedly and harms the victim. The purpose of this study was to determine (i) a description of bullying behavior and (ii) a description of bullying behavior based on gender by students at Madrasah Tsanawiyah Negeri 2 Aceh Besar. This study uses a quantitative approach with a descriptive method. The study population was 40 students who met the criteria for bullying perpetrators, while the research sample consisted of 40 students with a saturated sample, i.e., the entire population was the sample. Data collection techniques using a Likert scale questionnaire and data analysis techniques using descriptive analysis. The results showed that (i) the description of bullying behavior carried out by students at school was in the low category with an average of 42.28 or with a percentage of 70% (33 students) (ii) a description of bullying behavior based on gender as a whole on average are male students are 53.58 or with a percentage of 53% (10) of the total sample of 19 students and female students are 48.14 are in the low category with a percentage of 86% (18).Keywords: Bullying, Behavior, Students.