Office discipline referral (ODR) data are increasingly used to monitor student behavior problems and the impact of interventions, but there has been limited research examining their validity. The current study examined the concordance of ODRs with teacher ratings of student behavior using data on 8,645 children in 335 classrooms at 21 elementary schools. The results of a variety of analyses (e.g., correlations, multivariate analysis of variance, receiver operating characteristics) suggested that ODRs are moderately valid and reliable. Multilevel analyses revealed that teacher ratings of disruptive behaviors were significantly associated with ODRs, even after controlling for other student-, classroom-, and school-level factors. These findings suggest that ODRs are moderately valid indicators of student behavior problems and may be an efficient source of information for use in school-based research and data-based decision-making. (Contains 6 tables.)