Attention deficit hyperactivity disorder (ADHD) is one of the most diagnosed and treated disorders among child and adolescent psychiatry. Current studies focus on etiology, treatment, long-term results and mostly contain school age, adolescence and adulthood. Studies regarding symptoms, diagnosis and treatment of pre-school age are limited and interest on this issue has been increasing over the last years. Therefore, the purpose of present review is to give difficulties of diagnosis and differentiating diagnosis of pre-school ADHD and presentation of proven parent training programs. In the first section of the paper, clinical features and diagnosing stages of pre-school ADHD are presented. In the following parts parent training programs are attempted to be presented in a detailed way which may represent new perspectives to clinicians in the field.