The present study investigated bidirectional relations between peer victimization and internalizing symptoms, with a focus on three forms of victimization (physical, verbal, relational) and two types of internalizing symptoms (depressive, anxious). In the fall and spring, children (N = 1,264-1,402 fourth and fifth graders depending on time point and data source) reported on their victimization, and teachers reported on children's depressive and anxious symptoms. In a model including the broad constructs of victimization and internalizing symptoms, bidirectional relations emerged, with earlier victimization predicting increases in later internalizing symptoms and earlier internalizing symptoms predicting increases in later victimization. These bidirectional relations did not hold in two additional models, the first of which included the three forms of victimization and internalizing symptoms and the second of which included victimization and the two types of internalizing symptoms. Rather, results of the first model suggested that earlier internalizing symptoms predicted later physical, verbal, and relational (marginal) victimization, and the second model did not fit the data well. Findings are discussed in terms of implications of bidirectional relations between victimization and internalizing symptoms. K E Y W O R D S bidirectional, internalizing, peer relations, peer victimization | 943 MLAWER Et AL.