In this study, the predictive role of self-efficacy, gender and cyber victimization on cyber bullying in adolescents was examined. Examining whether the participants' mean self-efficacy, cyberbullying and cyber victimization scores differ significantly by gender are the sub-objectives of the research. The present study which was designed with a relational screening model was carried out with 185 eight graders. T-test and multiple regression analysis were used to analyze the data and analyses were carried out via IBM SPSS Statistics 23. Findings indicated that the means score of participants did not differ significantly in terms of gender. The independent variables were able to account for 23% of the variance in cyber bullying. The relative importance order of the predictor variables on cyber bullying was cyber victimization, gender, and self-efficacy. The t-test results on the significance of the regression coefficients indicated that among predictive variables cyber victimization is a significant predictor of cyber bullying, but self-efficacy and gender have no significant effect.