The objectives emphasize the diagnosis and therapical problems concerning the child's ovary tumors for a better care in our conditions of work. We collected in a retrospective study 12 cases of ovarian tumors during 30 years. The middle age of the patients was of 11 years with extremes of 2 years and 15. The circumstances of discovery of the tumor were represented by order of frequency by an abdominal tumor (10 cases), an abdominal pain (8 cases) and of the compression signs digestive or urinary (6 cases). The medical imagery (echography, intravenous urography, Chest X-ray) permitted to evoke in the majority of the cases the ovarian origin of the mass. The surgical treatment consisted in an ovariectomy (5 times), an salpingo - ovariectomy (6 times) and a surgery of partial exeresis associated to a chemotherapy. The operative continuations were simple. A patient died of intercurrentes complications. The histological exam of the operative piece showed that it was about benign tumors. However a brought closer surveillance proves to be necessary had consideration to the two noted recidivisms.