Malignant mixed Mullerian tumor (carcinosarcoma) of the ovary is rare neoplastic condition with an incidence of less than 1% of all ovarian neoplasms. Histologically, carcinosarcomas comprise of epithelial as well as mesenchymal components, which are either homologous (normally found in ovary) or heterologous (not normally seen in ovary). Here, we report a case of a 50 year old female patient who presented with abdominal distension and was diagnosed as malignant mixed mullerian tumor of bilateral ovaries histopathologically. Carcinosarcomas of the ovary are extremely rare and aggressive. We wanted to draw the attentionthat although it is more frequently unilateral and seen among the postmenopausal nullipara women, malignant mixed müllerian tumors can also be bilateral and seen among multiparas in the reproductive period as with this case report.