Objective: Cognitive errors in psychiatric disorders have been frequently investigated. In this study, we aimed to investigate the cognitive errors, cognitive domains including interpersonal relationships (IP) and personal achieve-ments (PA), and psychiatric comorbidity in the rumination (R) and cleaning (C) dimensions of obsessive-compulsive disorder (OCD). Methods: The disorder symptoms were assessed via the Maudsley Obsessive Compulsive Inven-tory (MOCI) and Symptom Check List-90-Revised (SCL-90-R). The Cognitive Distortions Scale (CDS) was used to evaluate cognitive errors. Results: There were 31 female patients with OCD-R, 31 female patients with OCD-C and 31 healthy female controls. The mean age and the mean education level of the patient and control groups were similar (p=0.461 and p=0.203, respectively). The patient and control groups were different in terms of MOCI, SCL-90-R, and CDS scores (p [Anadolu Psikiyatri Derg 2020; 21(6.000): 592-599]