Objective: Behavioral parent training (BPT) is a well-established treatment for ADHD; however, treatment response is variable. Consistency in parent skill use during BPT is known to influence child outcomes post-treatment, while less research has focused on specific child factors that may be impacting parent skill utilization during treatment. The current study examined associations between child organizational skills and emotion dysregulation (ED) with parent treatment adherence during BPT and post-treatment child impairment. Method: Parents of 72 children (Mage = 8.31) with ADHD symptoms and impairment participated in BPT which was embedded in a 12-week, multicomponent, school-based intervention for children delivered by school mental health clinicians. Outcomes included parent treatment adherence and child improvements in global impairment post-treatment. Results: Greater pre-treatment child organizational problems were associated with less parent treatment adherence regardless of ADHD symptom severity. Worse pre-treatment child ED was associated with more impairment post-treatment regardless of ADHD symptom severity whereas the effects of child ED on parent treatment adherence were moderated by child ADHD symptom severity. Conclusion: The current study suggests that pre-treatment child ED and organizational difficulties impact parent treatment adherence to behavioral interventions targeting ADHD symptoms, potentially in unique ways, and should be considered in future BPT treatment studies.