The purpose of this study is to identify the relationship between goal orientation and aggressiveness among under 18 handball players in Negeri Sembilan. This study used survey method using Task and Ego Orientation in Sport Questionaire (TEOSQ) and The Judgement About Moral Behavior in Youth Sport Questionaire (JAMBYSQ). The respondents are the Under 18 handball players that represent eight districts in Negeri Sembilan (n = 192, 96 male and 96 females). Data were analyzed using descriptive statistics (percent, frequency, mean and standard deviation) and inferential statistics (t-test) and correlation. The findings showed that the orientation pattern of the female players were higher than the male players for both the task orientation and the ego. The results of the t-test showed that female handball players have higher levels of cognitive and somatic anxiety than male players. However, from the aspect of aggression, the findings showed that female players are more likely to show aggressive action compared to male. In conclusion, the findings showed that there was a significant relationship between goal orientation and aggression among under 18 handball players. Indirectly, this study stressed the importance of goal orientation. Coaches also need to put more focus on the task-orientation compared to ego-orientation.