Ovarian fibromas are uncommon, accounting for 4% of ovarian tumors. The clinical examination, ultrasonographic, and tumor marker data remain the best preoperative approach currently available for ovarian tumors. However, the diagnosis remains histological. We hereby present the uncommon case of unilateral ovarian fibroma in a 55-year-old woman who presented with pelvic chronic pain the past 2 years. Underwent a bilateral adnexectomy through laparotomy and pathologic examination confirmed the diagnostic of ovarian fibroma. Our case is to illuminate the diagnosis of ovarian fibroma as a rare diagnosis and it should be considered in the differential diagnosis of solid ovarian masses.