Background: The students' activity program promotes cognitive restructuring of the students' roles involved in bullying/cyber bullying, while the modification of their cognitions promotes behavioral changes and improves social, emotional competence. Aim of this study: was to evaluate the effect of students' activity program on social, emotional competence and bullying behavior among Benha university students. Design: Quasi-experimental study design was used. Setting: The study was conducted to represent 25% from total 16 Faculties at Benha University4 faculties 2 theoretical (Faculty of Commerce and Faculty of Arts) and 2 practical (Faculty of Physiotherapy and Faculty of Nursing) at Benha University was chosen by simple random sample. Sample: A simple random sample of 345 university students was included. Tools of data collection: Tool (I): A structured interviewing questionnaire included two parts. Part I: Students' demographic characteristics Part II: A- students' knowledge regarding to students' activities. B- Students' knowledge regarding social and emotional competence. C- Students' knowledge regarding bullying and cyber bullying behavior. Tool (II): The bullying, harassment, and aggression receipt measure of bullying behavior and cyberbullying. Tool (III): Delaware social, emotional competence scale. Results: Revealed that 44.9% of the studied students had a good total knowledge level preprogram implementation, while post program increased to 78.8%. 5.2% of the studied students had high total level of bullying behavior preprogram implementation, while post program decreased to 0.4%. Moreover, 38.8% of the studied students had a high total social, emotional competence preprogram implementation respectively, while post program increased to 78.8%. Conclusion: Students activity program had positive effect on improving social, emotional competence and reducing bullying behavior of studied students. Recommendation: Replication of the present study with more participants and at several Universities settings for generalization of the results.