Background : Bully is an action that aims to hurt others through words or deeds. The Indonesian Child Protection Commission (KPAI) of the Special Region of Yogyakarta received 22 cases of bullying. The impact of bullying is students do not concentrate in learning. Research Objective : The objective of this research to determine the relationship of bullying with the concentration of study consentrate at Muhammadiyah 1 Seyegan Junior High School. Reseach Method : Type of research is non-experimental cross sectional study. The subject of this study were 87 students who victims of bullying. The technique of data collection was carried out with the bullied olweus victim queestionnaire and the learning concentration questionnaire. The analysis technique used the Spearman – rho analysis Result : The result of this study found as many as 87 students fell victim to bullying with p-value (0,702) with a good concentration of learning 14 %, 70% enough, less 16%. The majority of the ages 12-14 years 71 students (82%), female gender 50 students (57%), most of them in class VII 50 students (57%). Conclusion : There is no corelation between bully and study concentration of Muhammadiyah 1 Seyegan Junior High School students. The adolescents are able to control their emotions and are wise to comunicate and interact