To review the clinicopathological characteristics of ovarian masses in Korean premenarchal girls. Design: The data collected from hospital medical records were reviewed retrospectively regarding age, presentation, diagnosis, treatment, and outcome. Participants: There were 65 premenarcheal girls who underwent surgery at Seoul St. Mary`s Hospital between January 1990 and March 2012. The most common presenting symptom was abdominal pain (n=31, 47.7%), followed by palpable abdominal masses 16 (n=16, 24.6%), abdominal distension (n=8, 12.3%), vaginal bleeding (n=4, 6.2%), incidental finding (n=3, 4.6%), difficulty in urination or defecation (n=2, 3.1%), and prenatal sonographic findings (n=1, 1.5%). Of the patients with benign tumors, including non-neoplastic lesions and benign cysts, 26 (51%) underwent cystectomy, 6 (11.8%) underwent oophorectomy, 17 (33.3%) underwent unilateral salpingo-oophorectomy and none underwent bilateral salpingo-oophorectomy. Of the patients with malignant tumors, 2 (14.3%) underwent bilateral salpingo-oophorectomy, 7 (50%) underwent unilateral salpingo-oophorectomy, 2 (14.3%) underwent oophorectomy, and 2 (14.3%) underwent cystectomy. : Abdominal pain was the most common symptom. However, the incidence of ab- dominal distension was higher in patients with malignant tumors than in those with benign tumors. We assessed clinical features, operative outcomes, and histological classifications of Korean prememarchal girls with ovarian masses. Further studies with a larger number of subjects are needed to confirm our results.