This study validates a new self-report measure, the Ostracism Experience Scale for Adolescents (OES-A). Nineteen items were tested on a sample of 876 high school seniors to assess 2 of the most common ostracism experiences: being actively excluded from the peer group and being largely ignored by others. Exploratory and confirmatory factor analyses, bivariate correlations, and hierarchical regression provided support for the construct validity of the measure. The findings provided psychometric support for the OES-A, which could be used in research into the nature and correlates of social ostracism among older adolescents when a brief self-report measure is needed. Further, the OES-A may help determine how social ostracism subtypes differentially predict health-compromising behaviors later in development, as well as factors that protect against the most pernicious effects of ostracism.