Background: It seems that non-educational use and aimless surfing on the internet can have ‎negative consequences, such as victimization of non-ethical cyber bullying and reducing ‎students' sense of happiness. Therefore, the aim of this study was to investigate the relationship ‎between “cyber loafing" with” non-ethical cyber bullying" and "feeling of happiness". ‎
Method: The research method was a descriptive-correlation study. The research sample ‎consisted of 197 medical students of Shiraz University of medical sciences who were selected ‎by random sampling method. The research tools included the triple scales of cyber loafing, non ‎ethical cyber bullying and happiness, which after calculating their validity and reliability, were ‎distributed between samples and data were analyzed using structural equation model. ‎
Results: The findings showed that cyber loafing has a positive and significant relationship ‎with students' vulnerability to non-ethical cyber bullying. Also, cyber loafing and non-ethical ‎cyber bullying has a negative and significant relationship with students' happiness. ‎
Conclusion: By increasing awareness of students in order to reduce cyber loafing, can be ‎reduced non ethical cyber bullying and provide the basis for cyber space optimization and ‎increase students' sense of happiness.‎