Nowadays we are witnessing modern technological development that has changed our everyday life. Increasing availability and high levels of computer skills, especially anonymity, have enabled children to use technology for malicious behavior; one of the most commonly mentioned is cyberbullying. Cyberbullying is defined as any malicious and repeated use of information and communication technologies with the intent of causing harm to the person. The survey was conducted on a sample of 121 subjects of the seventh and eighth grades of the primary School in Glina. The aim of the research was to examine the correlation between experiencing and making cyberbullying and self-esteem in primary and secondary school students. In the research was used the Questionnaire on socio-demographic and general issues, the Scale of Experimentation and Experience of Cyberbullying and a Sub-Scope of Marsh's Self-Disclosure Questionnaire II. The research results show that there is a statistically significant correlation between the experience of cyberbullying and the self-respect of the physical appearance, the relationship with the parents and the school's competence, and the connection between the practice of cyberbullying and the self-esteem of relationships with parents. Also, there has been no statistically significant association between cyberbullying and self-esteem of physical appearance and school competence.