Hydatid disease of the genitalia was encountered in 12 female patients between 1957 and 1977, an incidence of 1 in 1000 gynecologic abdominal operations. The frequency of involvement of female genital organs in hydatid disease is very low, and its pathogenesis still remains obscure. The symptoms of the disease are not specific; they simulate those of ovarian cysts. Prior history and roentgenograms of calcified cysts contributed to the correct preoperative diagnosis. Surgical intervention consisted of extirpation of the hydatid cysts with or without hysterectomy. Histologic examination of the cystic elements revealed chitin layers in all specimens and scolex heads with hooklets in 60% of the cases. Both findings are characteristic of hydatid disease.