Small cell carcinoma of the ovary is a rare, distinctive, highly malignant, and undifferenciated carcinoma of unknown cullular lineage. It tends to occur in young women, and there is an associated paraneoplastic hypercalcemia in as many as two-thirds of reported cases. It has very poor prognosis and has been exceedingly difficult to treat. Thus a proven regimen of adjuvant therapy is not defined yet. We report here the two cases of primary small cell carcinoma of the ovary, which is presented with a brief review of the literature.