Attention deficit hyperactivity disorder (ADHD) is a common neurodevelopmental disorder characterized by elevated levels of inattention, impulsivity, and hyperactivity that can impair academic and social functioning. ADHD is also associated with increased levels of parenting stress, less effective parenting practices, and can disrupt the parent-child relationship. The importance of support for parents of children with ADHD is widely acknowledged in Japan, but specialized parent training programs targeting ADHD have not been available.