Relations among social preference, perceived popularity, social intelligence and two types of aggressive behaviour were studied. Peer-estimation techniques were used to measure all major variables. Altogether, 403 Greek schoolchildren from fourth-through sixth-grade classrooms participated in the study. Both overt and relational aggression were negatively associated with social preference for girls; overt aggression was positively associated with perceived popularity for boys. Relational aggression was positively associated with perceived popularity for both boys and girls, and social information processing only for girls. In addition, as was hypothesized, relational aggression was predicted by cognitive aspects of social intelligence whereas overt aggression by lack of social skills. Overt aggression was found to be a unique significant negative predictor of perceived popularity whereas relational aggression a positive predictor. Implications for intervention are discussed. (Contains 2 tables.)