Introduction: The present study is to examine the relationship between spiritual intelligence and aggression of elite male volleyball players at adolescent ages. Methodology: This study is methodologically descriptive. It is also a kind of correlational study and applied in terms of purpose. The population was the elite male volleyball players in Hamedan province and the statistical sample involved 52 elite male adolescent volleyball players aged 15 to 17 ( mean and SD 16.35 -+ 2.25) which were selected as the target sample through the available sampling methods from junior volleyball teams in Hamedan province. Spiritual Intelligence Self Report Inventory (SISRI) developed by King (2008) and the Buss–Perry Aggression Questionnaire (1992) were used to measure the variables. The results were analyzed using SPSS 23.0 and the findings were described inferentially (mean, SD, and the graphs). The data was analyzed using synchronized multiple regression for predicting the aggression through factors of spiritual intelligence, simple linear regression for predicting the aggression using the total score of spiritual intelligence and Pearson correlation test for determining the relationship between spiritual intelligence and aggression. In order to analyze the data, Pearson correlation coefficient and simple regression were used. Results: The results indicated a significant negative relationship between spiritual intelligence and aggression. Spiritual intelligence subscales also have a significant relationship with aggression. These findings showed that the more spiritual intelligence it is, the less probable it is for the male elite volleyball players to be aggressive. Discussion: It is suggested to carry out a similar study on team and individual sports` participants and female adolescents or other age groups and then compare the results. It is also recommended that, in future investigations, intervening variables such as economic status, religious background, and parenting
