This study examined the factor structure and reliability of a brief but comprehensive measure, the adolescent risk inventory (ARI), designed to assess adolescent risk behaviors and attitudes. Measures assessing demographics and risk behaviors were administered to 134 youth (ages 12-19) in psychiatric treatment. A confirmatory factor analysis of the four attitude scales (HIV Anxiety, HIV Prevention Self-Efficacy, General Distress, and General Risk) revealed excellent goodness of fit statistics. Exploratory factor analysis of the behavior items revealed three behavior factors (Sex Risk, Abuse/Self-Harm, and Acting Out). The preliminary analysis suggested that all subscales had reasonable internal consistency reliability and appeared to be independent measures, rather than part of a single unitary construct. Differences emerged based on gender, sexual activity status, and trauma history. Exploratory regression analyses revealed that, even when controlling for demographic factors and sex risk attitudes (e.g., HIV Prevention Self-Efficacy), Abuse/self-harm behaviors were highly significantly predictive of sex risk. These analyses suggest that the ARI can be useful in quickly identifying the broad range of risk behaviors found among adolescents with psychiatric disorders.