The research aims to examine the relationship between cyber bullying and self-disclosure. Participants of the study were 480 high school students who answered the scales. According to the results, the dimensions of cyber bullying; verbal cyber-aggression and exclusion, impersonation and visual-sexual cyber-aggression are negatively related to self-disclosure. Stepwise multiple regression analysis results showed that dimensions of cyber bullying affected self-disclosure and verbal cyber-aggression and exclusion was a strong predictor of self-disclosure. The findings of the research were discussed within the framework of literature.