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Luteinized thecomas are one of the sex cord stromal tumors of the ovary rarely undergoing ossification. We report a case of a 66-year-old post-menopausal female with the chief complaint of uterine bleeding of 7 months duration. Endometrial curettage performed showed features of endometrial adenocarcinoma. Follow-up total abdominal hysterectomy revealed bilateral luteinized thecomas of the ovary, one of which had undergone massive ossification converting the ovary into a bone. True bone formation in ovarian tumors is rare. This case is the second in the literature of osseous metaplasia in an ovarian luteinized thecoma, with the association of endometrial adenocarcinoma suggesting its functional status.