This study aimed to examine joint trajectories of aggression and peer victimization from early to middle childhood and their links to physical violence perpetration and online violence victimization in adolescence. The study used multi-informant longitudinal data for 2121 participants (53.4% boys) spanning from early childhood to mid-adolescence. Parallel-process latent class growth analysis of teacher and parent reported aggression and peer victimization identified five distinct joint trajectories: uninvolved (58.4%), low aggression (17.7%), high decreasing victimization (8.4%), both increasing (7.8%), and high aggression/moderate victimization (7.7%). Chi-square Wald tests of outcome differences across joint trajectories showed that the trajectories characterized by the highest levels of peer victimization, high decreasing victimization and both increasing, had an increased risk of self-reported physical violence perpetration in adolescence. There were no associations between joint trajectories and online violence victimization in adolescence. These findings indicate that there is substantial heterogeneity in children's development of aggression and peer victimization, and that high peer victimization seems particularly salient for physical violent tendencies in adolescence.