The problem in this study is relational aggression in teenagers at Cetiya Dharma Sena Tangerang due to differences in the nature and attitudes of teenagers, some are easily jealous. This behavior is in the form of threats, mocking, criticizing, isolating and robbing one or more teenagers to the victim or to other teenagers.This research uses descriptive qualitative research. The subject of this research is the head of youth and youth at Cetiya Dhama Sena. This research was carried out from January, Februari to August 2021. The data collection techniques used were observation, interviews, and documentation. Test the validity of the data include credibility, transferability, dependability, and comfirmability. The data obtained were analyzed using the Miles and Huberman model, namely data collection, condensation, display, and conclusion.The results of this study are: (1) The forms of aggression carried out by teenagers at Cetiya Dhamma Sena Tangerang are teenagers who are not easy to get along with, teasing, laughing, insulting someone, mocking, joking excessively, insulting someone physically. (2) The cause of teenagers doing aggression is ignorance of what is said by the teenager because students tend to imitate the words of others. Then seek the attention of others, seek attention, family factors, influence of friends, home environment, personal factors. The cause of adolescents experiencing aggression is because they are physically different, have different abilities and lack guidance. (3) This has an impact on perpetrators and victims of aggression, youth leaders, and cetiya. In the face of aggression carried out by youth leaders and cetiya in general and Buddhism