The purpose of this study was to produce a typology of behavior problems in preschool children. Distinct subtypes were identified through the use of cluster analytic techniques on data from the Behavior Assessment System for Children (BASC)--Parent Rating Scales. Analyses were based on archival data collected on a sample of 268 children, aged 2 to 5 years, who were referred to determine their suitability for a day treatment program. Five distinct and reliable subtypes of preschool children's behavior problems emerged. Ratings of adaptive and social skills based on the BASC Adaptive Scales and measures from the Parenting Stress Index served as external variables to assess the distinctiveness of the derived subtypes. The findings provide evidence for the reliability and validity of the subtypes identified in this study that are consistent with the findings of previous subtyping investigations focusing on school-aged children. (Contains 6 tables and 5 figures.)