Family involvement in education, including quality of family-school communication, has been demonstrated repeatedly to have a substantial effect on child development and success in school; however, measures of this construct are limited. The purpose this study was to examine the factor structure and concurrent validity of the Quality of the Parent-Teacher Relationship, a subscale of the Parent-Teacher Involvement Questionnaire (PTIQ) in a sample of children with ADHD. Participants were 260 parents and teachers of children diagnosed with ADHD in grades K to 6. Results provided support for a two-factor model, consisting of separate factors for parents and teachers, and correlational findings provided support for concurrent validity. This measure appears to have utility in assessing parent-teacher relationships and evaluating the effectiveness of family-school interventions.