Introduction: The present study aimed to investigate cognitive inhibition and recognition in patients with obsessive-compulsive disorder and to compare them with normal group.Methods: Statistical population of this research comprised of all patients with obsessive-compulsive disorder aged 25-45 that had come to mental hospitals, clinics and consulting centers located in Ardebil, Iran. The normal population included all the normal people aged 25-45 in Ardebil. Forty people were conveniently selected for each group (80 in total). They were matched for age, sex, and education. The instruments were Stroop test, and Wechsler Memory Scales. The data were analyzed by multivariate analysis of variance.Results: The results of research suggested poorly cognitive inhibition in patients with obsessive-compulsive disorder than healthy people, but not in cognitive recognition.Conclusion: In cognitive inhibition, people with OCD performed significantly more poorly than normal people.