The authors describe a rare case of a giant nabothian cyst in a 52-year-old woman. The patient had a history of massive abnormal uterine bleeding after heavy physical work. A giant cystic mass, originating from the cervix, was found completely filling the upper third of the vagina. The authors combined hysteroscopy examination with ultrasound to assess the cystic mass’ localization, origin, and relationship with other organs. With the tentative diagnosis of a giant nabothian cyst, the patient was treated with a simple cervical incision and local drainage. The patient recovered well postoperatively and the diagnosis was confirmed through pathological examination.