An isolated unilocular renal hydatid cyst is very rare and to the best of our knowledge, no such case has been reported in the Korean literature. A 56 year old woman, who liked eating raw vegetables fertilized by dog feces, visited our department because of an incidentally found renal cyst. Ultrasonography and the computed tomography (CT) scan showed a typical daughter cyst within the 6cm sized mother cyst. We performed retroperitoneal laparoscopic cyst marsupilaization after aspiration of the cystic contents and injection of a scolecidal agent. No dissemination and no recurrence have occurred to date.