The current study investigates the longitudinal association, across a 1-year period, between self-esteem and narcissism with bullying and peer victimization. The sample consisted of 1,416 (50.1% girls) Greek Cypriot early adolescents ("M" age = 12.89) who completed a battery of self-report measures. The small correlation found between self-esteem and narcissism suggests that the two constructs are distinct from one another. Results from the Hierarchical Linear Regression analyses suggested that the combination of low self-esteem (i.e., fragile self-concept) with high narcissism (i.e., grandiose self-view) may contribute to the continuation of both bullying and victimization. Person-centered analyses clarified narcissism predicted membership into "bully" and "bully-victim" groups, although "bullies" were distinguished by low self-esteem when compared with uninvolved children. Current findings can help provide an explanation of the inconsistency reported in the literature in terms of the association between self-esteem and bullying behavior, in that low self-esteem is more strongly associated with bullying for narcissistic youth.