Background and Purpose: Internet addiction in students has negative and destructive consequences for the individual and society. The present study was conducted to investigate the role of social support and educational expectations stress in prediction of internet addiction in students.
Method: The research design was descriptive and correlational. Data were collected from 246 high school students from schools in Tehran during the academic year of 2015-2016 using available sampling method. Multidimensional Scale of perceived social support (MSPSS), internet addictions test (IAT), and academic expectation stress inventory (AESI) was completed by students. The data were analyzed by using of Pearson correlation and step by step regression.
Results: Stress from parents' expectations and their expectations have a positive relationship with Internet addiction, while social support of friends and family has a negative relationship with online addiction. Also, the results of regression analysis showed that social support of friends (p <0.001), stress due to parents' expectations (p <0.001), stress due to their expectations (p <0.001), and family support (p <0.01) significantly predicts students' Internet addiction. The predictive variables of the predictor account for 69% of the variance of Internet addiction. The predictor variables explain a total of 69 percent of the variance of internet addiction.
 Conclusion: Findings showed that family expectations and their support play an important role in predicting internet addiction; therefore, the design of family-based preventive programs is necessary to reduce the tendency of adolescents to internet addiction