This study is to investigate the executive functions of students with depression, anxiety and stress symptoms in comparison to healthy ones. This study is a comparative and non clinical analysis. The population is limited to students in Tehran. In total 448 students were recruited as a sample using a convenience sampling method. They were also screened by using a DASS Test comprising of 21 questions, 29 people were depressed, 27 had anxiety and 15 were suffering from stress. Subsequently, 50 people were matched with them. Then both groups were compared using the Stroop test, Wisconsin Card Sorting and a cognitive ability test. Data analysis using MANOVA showed that there are no significant differences between four groups in selective attention and shifting attention. Depressed group reacted rapidly as opposed to the anxiety group in measures of shifting attention and in cognitive abilities; it is observed that the memory, inhibition control, planning and flexibility of the healthy group are better than the three groups.