Aim: To find out the prevalence of obsessive compulsive symptoms / disorder among patients of headache. Methodology: Patients with headache diagnosed clinically at medicine out patients department were selected for the study. Yale–Brown Obsessive Compulsive Scale was applied to find out the prevalence and nature of obsessive compulsive symptoms. Results: A total of 200 patients were participated and it was found that 8.5 % of headache patients had obsessive compulsive disorder. Conclusion: The prevalence of obsessive compulsive disorder among the patients of headache was found to be 8.5 %.