Epidermoid cyst of the ovary is a very rare tumor. There have been only 21 case reports of it previously. We describe the computed tomography (CT) and magnetic resonance (MR) findings of 2 cases of ovarian epidermoid cyst. To our knowledge, this is the first report describing CT and MR findings of epidermoid cysts of the ovary, and ruptured epidermoid cyst of the ovary has never been reported.