The frequency of cancer during pregnancy is approximately 1 per 1000 live births. This rate may increase as more women postpone childbirth until later in life, when cancer becomes more frequent. Pregnancy affects management of the cancer, and the cancer affects the management of pregnancy. The most common malignancies, in order of frequency, are breast cancer, leukaemia and lymphomas as a group, melanoma, gynaecologic cancers, and bone tumours. Ovarian tumours are found in about 1 in 1000 pregnancies and 3-6% of these are malignant. Thus, ovarian cancer occurs in approximately 1 in 12,500-25,000 pregnancies. Here, we report a case of ovarian mucinous carcinoma that was diagnosed at 22 weeks of gestation. After conservative surgery, she was given three cycles of carboplatin chemotherapy. She delivered at 33 weeks of gestation and after undergoing surgery she was given six cycles of paclitaxel and carboplatin chemotherapy. The patient is now being followed by the oncology department with no evidence of disease.