This research aims to analyze the relationship between interpersonal intelligence and prosocial behavior among students of elementary school. As a case study, it takes 156 students of an elementary school in Yogyakarta Special Region, Indonesia as participants aged 10-12 years old. The result shows positive and significant correlation between interpersonal intelligence and prosocial behavior among participants, as shown by coefficient of correlation r=0.722 and p=0.000. Three aspects of interpersonal intelligence also show significant correlation with prosocial behavior. The finding suggests the need of school endeavor to improve environment that enhance interpersonal intelligence and prosocial behavior. Furthermore, the finding also suggests the importance of counseling teachers to develop students’ interpersonal relation skills to enhance their interpersonal intelligence. As interpersonal intelligence was enhanced in school environment, prosocial behavior is expected to be improved in students’ daily life.