Theories and models suggest cultural influences on children’s family and peer socialization. It is conceivable, therefore, that the development of relational aggression, which is a part of developmentally salient social experiences, may appear differently, depending on cultural contexts. The goal of this chapter is to summarize cross-cultural, international studies that have examined the development of relational aggression in various cultural contexts. Specifically, studies are reviewed that have evaluated psychometric properties of measures and have explored social-cognitive processes, peer relationships, victimization experiences, and psychopathology among relationally aggressive children and adolescents across cultures. Finally, developmental and clinical implications and directions for future research are discussed.