Children with disruptive behaviors have an increased risk of ongoing and more severe problems throughout life. Early intervention can mitigate these consequences. We used a single-case design to research the impact of Adlerian group play therapy on children’s disruptive classroom behaviors. Results were mixed, with an overall improvement in children’s behaviors over the course of the study. Detailed results, implications, limitations, and suggestions for future studies are described. (PsycINFO Database Record (c) 2019 APA, all rights reserved)