The present study examines multiple types of victimization simultaneously, their preva-lence and characteristics in childhood and adolescence, and it examines the associationsbetween victimization and poly-victimization on the one hand and single and multiplemental health and behavioral problems on the other. The sample consisted of 2,500 Swedishyoung adults (20–24 years) who provided detailed report of multiple types of lifetime vic-timization and current health and behaviors via an interview and a questionnaire. Resultsshowed that it was more common to be victimized in adolescence than in childhood andmore common to be victimized repeatedly rather than a single time, among both malesand females. Males and females were victimized in noticeably different ways and par-tially at different places and by different perpetrators. With regard to mental health andbehavioral problems, anxiety, post-traumatic stress, self-harm, and criminality were clearlyoverrepresented among both males and females who had experienced any type of victim-ization. Poly-victimization was related to single and multiple mental health and behavioralproblems among both males and females. We conclude that professionals need to conductthorough evaluations of victimization when completing mental health assessments amongtroubled youths, and that youth might benefit from the development of interventions forpoly-victimized youth.