Hydatid disease, caused by Echinococcusgranulosus, is a common parasitic infection of the liver. Disseminated intra-abdominal hydatid disease may occur with the rupture of the hydatid cyst into the peritoneal cavity, producing secondary echinococcosis. But primary hydatid cyst in the pelvis is rare. We report a case of bilateral hydatid cyst of the pelvis in a 53years old woman presented with adnexal cystic mass.