Background: Obsessive compulsive disorder (OCD) is a common and potentially debilitating disorder. Neuropsychological assessment provides unique complementary information that is critical for evaluating higher cortical abilities. This study aimed to assess the neuropsychological functions in OCD patients which can then point to the brain structures or pathways and to study the correlation between these assessments and different clinical variables. Methods: This cross-sectional case control study had included sixty patients who were divided into two groups, Group I: thirty OCD patients diagnosed by DSM-IV and Group II: thirty healthy controls who were recruited from the community, matched with patients’ age, gender, and education. Results: The age of onset in our study was 19.13 ± 0.35 years, the mean duration was 7.44 ± 3.88 years, 40% of the studied cases had severe OCD symptoms and 33.3% of them were compulsive cleaners. There was a high significant difference between the two groups regarding WCST in favor of the control group. There was a high significant difference between the two groups regarding ROCF where the control group showed better results than the OCD patients. Conclusions: Neuropsychological test performance remains an informative and objective means of investigation, especially when applied to psychiatric disorders. The executive functions in OCD patients were impaired in comparison to the normal study subjects.