Although most previous reports recommended operative treatments for ovarian hemorrhages, management of idiopathic ovarian hemorrhage with massive intraabdominal hemorrhage has not been established yet. In order to evaluate effectiveness of non-operative management for idiopathic ovarian hemorrhage, 3 patients with idiopathic ovarian hemorrhage and massive intraabdominal hemorrhage (700-1,400 ml) were managed conservatively and monitored by ultrasonography. Non-operative management had successful results in two of the three patients and the other case showed a spontaneous hemostasis of ovarian bleeding at operation. As the first therapy for idiopathic ovarian hemorrhage without any severe complications, non-operative management should be chosen to avoid pelvic adhesions. 700-1,000 ml of intraabdominal hemorrhage were found to be naturally absorbed in a week by ultrasonography. This is the first to report that natural absorption of massive intraabdominal hemorrhage associated with idiopathic ovarian hemorrhage was captured in details by ultrasonography.