Hydatid cyst is one form of parasitic infestation caused by the larval stage of a cestode species called Echinococcus. The omentum is one of the rarest sites for harboring hydatid cyst. We are reporting a hydatid cyst of the omentum in a 14 year-old Ethiopian patient. Due to its rareness, information about the appearances of hydatid cysts within the omentum is inadequate. We believe that this case report will help to augment the knowledge about hydatid cyst of the omentum by describing and discussing clinical and radiological findings. [ABSTRACT FROM AUTHOR]