Disciplinary exclusions, particularly out-of-school suspension and expulsions, are a pressing concern for schools, as research demonstrates that they are associated with myriad deleterious outcomes such as increased risk for poor academic achievement, school dropout, and contact with juvenile justice. Research suggests that School-Wide Positive Behavior Interventions and Supports (SWPBIS), a prevention and intervention framework for addressing school-based problem behavior, can have a significant and meaningful impact on reducing the likelihood of student suspensions and expulsions. In this study, we conceptually replicated a series of previous studies conducted in other states and examined the effect of universal SWPBIS on disciplinary exclusions in California. Using propensity score matching, we examine differences in suspension and expulsion rates for 98 schools implementing universal SWPBIS with fidelity and 98 comparison schools not implementing SWPBIS. Results suggest that schools implementing SWPBIS with fidelity have significantly fewer suspensions. No effects were found for expulsions. Implications and recommendations for future research are discussed.