Introduction: Ovarian cancer is the second most common cancer of the reproductive organs and the most common cause of death from malignancy of reproductive organs. Ovarian tumors are very different in terms of histology. The studies showed a large variation in prevalence and types of ovarian tumors at different ages. This study was performed with the aim to evaluate the frequency of the ovarian lesions at different age categories.
Methods: this descriptive study was performed on 350 ovarian pathology samples of women referred to Pathology Center of Khorram Abad Shohadaye Ashayer during 2002-2012. Data related to physical examination and demographic data and chief complain of patients obtained from archival records and if necessary contact with them. The vague pathology specimens and insufficient records were excluded. Data was analyzed by SPSS statistical software (version 16). P< 0.05 was considered significant. 
Results: 83.4% of masses were related to reproductive ages that 91.4% of them were benign and the malignant tumors were predominantly observed in pre and post menopausal ages.  Many masses were discovered and removed during other abdominal surgeries such as appendectomy that mostly were in reproductive ages andmost of them were benign.
Conclusions: despite functional cysts are more common in reproductive ages, the highest prevalence of ovarian malignant lesions are seen in  pre and post menopausal ages that Cerocyst adenocarsinoma is the most common. According to the increased prevalence of ovarian malignancies in these age categories, follow up of the masses in these age groups is very important. Therefore, it is recommended that this subject be given more importance in the annual examinations.