This research was aimed to find out the relationship between social identity and conformity with agression of football supporter of Persisam Putra Samarinda. The samples of this research consisted of 75 football supporters of Persisam Putra Samarinda. The data was collected with social identity scale, conformity scale and aggresion scale. The data analysis techniques used analysis multiple regression. The result of this research showed that there was significant
relationship between social identity and conformity with aggression of the footbal supporter of Persisam Putra Samarinda with F = 6.367, R² = 0.150 and p = 0.003.
Then the result of subsequent studies showed that there was negative relation between social identity and agggression with beta = -0.348, t= -3.039 and p = 0.003.There is no relation between conformity and aggression with beta = -0.92, t = -0.806 and p = 0.423.