This study investigates the effects of individual and classroom variables on peer victimization through the use of multi-level models. The participants were 297 preschool children recruited from preschools. Teachers completed rating scales that assessed peer victimization, aggression, and prosocial behaviors. Peer nomination was used to measure social preference and friendship. The results showed that the aggression level of classrooms as well as social preference and friendship were associated with peer victimization. The findings imply that the individual as well as the social context should be considered before preventive intervention programs for peer victimization are implemented.