This study examines the effect of group-counseling programs for parents of children with Attention-Deficit/Hyperactivity Disorder (ADHD) on parenting stress, parenting competence, and symptoms related to ADHD. For this study, 9 parents of children with ADHD were selected as an experimental group that participated in a group-counseling program and another 9 parents of children with ADHD for a control group that participated in a group of free conversation without a program. The program consisted of 9 sessions (a 70 minute meeting per session) with 2 sessions a week. Data were analyzed by a paired t-test and independent samples t-test, using SPSS program packages. Results showed significant before and after differences in the degree of parenting competence and that Parenting competence was improved with the experimental group.