Objective: Attention deficit hyperactivity disorder (ADHD) is a neurodevelopmental disorder which is widely seen in school age children and adolescents. ADHD is seen in boys 2-10 times more frequent than girls. Attention processes are carried out by the neural network system which different brain regions form intense interconnections between them. Children with ADHD may have some difficulties in selective attention, sustained attention and visual-spatial attention functionality, which is one of the visual attention components. The purpose of this study was to investigate the selective attention, sustained attention and visual-spatial functions in boys with ADHD diagnosis.