Cystadenofibroma of the ovary, a relatively rare benign tumor, usually appears during the fourth and fifth decades. This tumor has malignant ultrasonographic features and may also macroscopically appear as malignant during surgery. Since this tumor has a rare malignant potential, it is well-advised to be aware of the possibility of a cystadenofibroma before selecting an aggressive surgical approach in young patients. We present five cases of young patients with cystadenofibromas of the ovary.