This longitudinal study investigated how changes in peer victimization were associated with changes in internalizing symptoms among 662 adolescents across a 4-year period. The moderating effects of initial levels of father, mother, and friend emotional support on this association were also examined. Gender and age group differences (early adolescent group aged 12-15 years; late adolescent group aged 16-18 years) were tested. Increases in physical and relational victimization were related to increases in internalizing symptoms. Friend emotional support was more protective in reducing internalizing symptoms for adolescent males than adolescent females in both the early and late adolescent groups. Gender differences also moderated the effects of mother and father emotional support. (Contains 6 tables.)