Abstract: Basal Cell Carcinoma (BCC) as a type of skin cancer is one of complications of overexposure to sunlight Ultraviolet (UV) radiation. Although radiotherapy and chronic arsenic poisoning are predisposing factors for BCC, the role of sunburn is essential. The aim of this study was to determine the sex-age specific incidence and prevalence of the main pathological types of BCC. This retrospective study was performed based on histopathology report cards of pathology ward of Boo-Ali Sina Hospital of Mazandaran University of Medical Sciences in Sari/Iran between 1993-2006. We studied the BCC pathology reports extracted from all histopathology report cards of pathology ward archive of the hospital. Two hundred and thirty seven cases (with mean age of 57.7 years) were studied. One hundred twenty of them were men. Out of 237 BCC samples, 208 (87.76%) were solid with maximum number of cases, 14 (5.91%) adenoid, 12 (5.06%) keratotic and 3 (1.27%) were cystic. The mean ages of solid, adenoid, keratotic and cystic cases were 51.7, 53.6, 62.7 and 49.4, respectively. Based on results of the study, considering high incidence of BCC in women older than 50 years, biopsy from suspected lesions to rule out BCC is recommended.