Intracranial mature teratoma is a very rare neoplasm. Its location in posterior fossa of cranium is extremely rare, only few cases have been reported in English literature. Though rare, it nevertheless warrants greater emphasis than it receives in the literature. The authors report a case of mature cystic teratoma in posterior cranial fossa in a 5 month old female child. On MRI examination heterogeneously enhancing solid cystic lesion measuring 4.2x4.0x3.9 cm was noted in posterior fossa involving left cerebellar hemisphere. On histopathological examination confirm diagnosis of mature cystic teratoma was established.