Ossified chronic subdural hematoma is a rare complication of chronic subdural hematoma rather than calsified form with an estimated rate 0.8-10% for both. We reported a 42-year-old female admitted to our clinic for severe headache, progressed in 2 years. The only trauma the patient had was that a big stone was felt to her head when she was 5-years-old. Neurological examination was normal. Computed Tomography (CT) and Magnetic Resonanse Imaging (MRI) scan revealed an ossified lesion. The previous diagnosis was calsified meningioma. The ossified lesion completely removed with a right frontoparietal craniotomy. The pathological diagnosis was bone. Postoperatively the patient was neurologically intact with no headache.