Brenner tumor (BT) is arare type of surface epithelial neoplasm found in the ovaries, accounting for just 2% of all ovarian tumors. They are typically diagnosed in post-menopausal women in their fifth to sixth decade of life. The occurrence of BT in young adults is uncommon. The coexistence of BTs with other surface epithelial tumors is unusual. The tumors are usually small, solid,unilateral and detected incidentally however, when they contain cystic components, they can appear larger. The proposed histogenesis is that they stem from urothelial metaplasia of the ovarian surface epithelium.There are only a very limited number of published case reports that discussbenign BT coexisting with a mucinous cystadenoma of the ovary in young adults. Therefore, we are presenting thiscase report, involving similar tumor in a 30-year-old unmarried woman.