IntroductionAttention deficit hyperactivity disorder (ADHD) is a common neurodevelopmental disorder in children whose symptoms were first described by Heinrich Hoffmann in 1863. 1 It is characterized by disruption of inattention, conduct disorder, poor social communication, and hyperactivity/impulsivity. Inattention causes an inability to remain focused on schoolwork, seeming not to listen, and losing things at school more frequently than what is consistent with the child's developmental level. Hyperactivity and impulsivity, on the other hand, result in excess activity, fidgeting, trouble remaining seated, disturbing others' activities, and trouble waiting for one's turn. 2,3 ADHD tends to overlap with other common externalizing disorders in children, such as oppositional disorder and conduct disorder. 4,5 If the condition persists until adulthood, it often leads to social performance deficit as well as educational and professional dysfunctions. 6 Although hyperactivity subsides with age, attention deficit increases in most patients. 7 In most cultures, demographic surveys report a prevalence of nearly 5% and 2.5% in children and adults, respectively. 8 Overall, the disorder affects boys more than girls, with 1.2% and 1.6% higher occurrence during childhood and adulthood, respectively. However, girls are more prone to displaying inattention symptoms. 9 Evidence from various studies in neuropsychology, 10 pathophysiology, 11 genetics, 12 and phenotypes, 13 suggest that several factors with varying levels of intensity manifest clinically as attention deficit and hyperactivity. Since the 1970s, numerous studies have identified impairments in executive functioning as the core cause of ADHD in adolescents. 14 These impairments lead to deficits in essential cognitive abilities for complex goaloriented behaviors and adjusting to a range of changes and environmental demands. 9 several authors 15,16 believed that some, but not all, children with ADHD suffer from significant impairments in several areas of executive functioning; however, other authors such as Brown 17 discussed that ADHD is fundamentally a developmental disorder that affects executive functions (EFs) in all cases. Thus, this paper focuses exclusively on this issue. The aim of this study is to review existing research on cognitive impairments in children with ADHD with a focus on EFs.