Ovarian cyst is a rare disease in infancy and childhood. Functional cysts are the most common benign ovarian tumor observed during childhood. Ultrasound examination in children with abdominal pain has improve diagnostic accuracy with an associated increase in the frequency of functional cysts (60% of the cases). Diagnosis of organic cysts is often made late. Germ cell tumors, often dermoid cysts, occur more frequently than in adults. Ultrasonography and laparoscopy are important diagnostic tools for ovarian cysts in children. Serum CEA, alpha-fetoprotein and ßHGC are routine tests for organic tumors. Laparoscopy is generally proposed for treatment except for small functional cysts with a transonic structure. Spontaneous involution is generally observed.