Ovarian germ cell tumours are rare. Of the germ tumours the dermoid cyst is the most common; however the association of carcinoid tumour with the dermoid cyst is exceptional. We report a case of a 38-years-old woman diagnosed with primary carcinoid tumor of the right ovary arising in mature cystic teratoma. It is the histological examination, with the immunohistochemical study that allowed the positive diagnosis. Surgical treatment ofen consists of unilateral anexectomy.