The goal of the current study was to examine the effect of PEERS®, a 14-week parent-assisted friendship-building program for adolescents with ADHD, on parental functioning, quality of the parent-adolescent relationship, and family functioning. Participants included 25 parents (19 mothers, 6 fathers) of adolescents with ADHD. Families completed the Program for the Education and Enrichment of Relational Skills (PEERS®; Laugeson & Frankel, 2010). Measures of parenting stress, parental efficacy, parent-adolescent communication, parent-adolescent involvement, causal attributions for negative social interactions, and family chaos were completed by parents at pre and posttreatment. Parents demonstrated statistically significant improvements in parenting stress and parent-adolescent communication and marginally statistically significant improvement in parental efficacy. Parents also demonstrated statistically reliable change in measures of parenting stress, parent-adolescent communication, parent-adolescent involvement, and family chaos. Overall, these findings demonstrate the benefit of PEERS® at improving parental functioning, quality of the parent-adolescent relationship, and family functioning for families of adolescents with ADHD.