Previous studies have demonstrated that several contextual factors influence the relationship between aggression and peer victimization in early adolescence, including gender of the same-sex peer group and gender composition of the school. The current study replicated and expanded on this research by examining the moderating influences of gender of the same-sex peer group, same-sex peer group norms, and classroom gender composition in a sample of early adolescents from Barranquilla, Colombia. Multilevel modeling analyses indicated that both relational and physical aggression were positive predictors of peer victimization. Relationally aggressive girls were at a lower risk for victimization while physically aggressive girls were at a higher risk. Relational aggression was a weaker predictor in classes with a larger proportion of girls. Additionally, relational aggression was a weaker predictor in same-sex peer groups with a greater prevalence of relational aggression. These findings provide further evidence of multiple forms of contextual influence on social behavior. Practical implications for these findings are also provided.