Background: Adolescence is a period of transition from childhood to adulthood with various growth characteristics and emergence of developmental responsibilities that can cause strains on self-esteem for adolescents, such as low self-esteem. This phase in life is interpreted as a time of fear or worry in very threatening situations. Notably, this is related to the bullying behavior of teenagers to their contemporaries and is commonly demonstrated through acts of intimidation, ridicule, and social marginalisation. It also demonstrated though verbal denigration and humiliation, thereby leading to low selfesteem to the victim. Research Objective: The purpose of this study was to research self-esteem in adolescent victims of bullying at SMAN 1 Kasihan Reseach Method: The method of research used descriptive quantitative. The subjects of this study were 92 Class 1 senior high school students. Data collection techniques used were purposive sampling carried out with Rosenberg’s specified bullying questionnaire and self-esteem questionnaire (Rosenberg self-esteem). Results: The results of the study found that the level of self-esteem in victims of bullying in the category of Normal. Conclusion: The victims of bullying are mostly aged 16 years with the category normal and low self-esteem is also dominated by the age of 16 years.