Jung-A Oh, Young-Joo Lee, The Influence of Father’s Parenting Behavior and Teacher’s Behavior on Cyber Bullying, Journal of Engineering and Applied Sciences, Volume 12,Issue 14, 2017, Pages 3604-3611, ISSN 1816-949x, jeasci.2017.3604.3611, (https://makhillpublications.co/view-article.php?doi=jeasci.2017.3604.3611) Abstract: This study, examines the influence of father’s parenting behavior and teacher’s behavior passing through adolescent’s aggression and delinquency on cyber-bullying. Adolescents attending school from 4th grade in elementary school to 3rd grade in middle school were surveyed by purposive sampling and a total of 495 surveys were used in the final analysis. The collected data was analyzed by SPSS 21.0 Program and AMOS 21.0 Program and “Bootstrapping methods” was usedin order to strictly verify the variant’s indirect effect’s statistical significance. Results show that first; teacher’s helping behavior and adolescent’s aggression and delinquency turned out to have a direct influence on cyber-bullying. Second, father’s parental behaviors such as excessive expectation, neglect and affection have a direct influence on cyber-bullying. Third, teacher’s behaviors such as teacher’s helping behavior and adverse feedback have a direct influence on adolescent’s aggression and delinquency. Fourth, father’s parental behavior and teacher’s behavior passes through adolescent’s aggression and delinquency and has an indirect influence on cyber-bullying. Based on these results, the mediation role of fathers and teachers on cyber-bullying has proved to be significant. The development of father’s education programs and manuals taking action on adolescent’s cyber-bullying are suggested. Keywords: Fathers parenting behavior;teacher’ behavior;aggression;delinquency;cyber bullying