Objectives: the aim of the study was to investigate the effectiveness of a training program to reduce child bullying on the extent of bullying behavior among fifth grade elementary students in Abarkouh. Method: To implement research after applying sociometry and administering the questionnaire for the relationship between homogenous students (some parts of which measures bullying among children), 20 of children classified as bullying children were randomly assigned to two 10-person control and experimental groups. Experimental group received 9 sessions (once a week) of training program to reduce bullying. But control group did not receive any training. Subjects of the study were evaluated again after 45 days. Data were analyzed using statistical software SPSS16, descriptive indicators and MANCOVA. Results: Results showed a significant difference (P ≤ 0/001) between experimental and control group in post test stage. In follow-up stage also results showed a significant difference (P ≤ 0/001) between experimental and control group. Conclusion: Regarding the significant difference between experimental and control group in post test and follow-up stage, we can say, the training program to reduce bullying among children can be used as an effective method to reduce bullying among bullies. Conclusion: Results have been discussed based on the theoretical and practical implications.