Attention Deficit and Hyperactivity Disorder (ADHD) is a neurodevelopmental and behavioral disorder. Dysfunction in executive functions is core symptom of ADHD. The aim of this study is to compare the sustained attention in children with ADHD and typical children. The research design of this study was ex post facto. The participants were 71 children with ADHD and 78 normal children selected by convenience sampling method. The sustained attention performance were assessed by attention registration. Data in this study were analyzed by independent t-test and factorial analysis of variance. Findings indicate that significant differences between the ADHD group and normal group in sustained attention (p>0/0001). According to study results children with ADHD in sustained attention had weaker performance than normal.