This chapter reviews 231 research studies (representing 233 different samples) on personal poly-victimization—defined as experiencing more than one type of personal victimization. Definitions, descriptions, and operationalizations of poly-victimization were reviewed across studies, along with samples, methods, and prevalence rates. While nuances existed, this research broadly defined, operationalized, and/or referred to poly-victimization as experiencing more than one victimization. Various types of victimization were examined, but a majority of this literature explored childhood maltreatment, assessing these experiences among general population, school-based, and high-risk samples. Prevalence rates ranged widely, depending on the sample used, victimization type(s) explored, and the measurement of recurrent victimization.