We previously reported an association between dyslipidemia and endometrial cancers. Osteoporosis is also reported to relate with some cancers. A common etiologic event has been proposed between dyslipidemia and osteoporosis. However, the pattern of interrelationships among dyslipidemia, osteoporosis and endometrial cancer is not well understood. To improve the quality of life of endometrial cancer survivors, these relationships should be determined. This study included 179 Japanese menopausal women who underwent bilateral salpingo-oophorectomy, including 114 women with incident endometrial cancer and 65 without endometrial cancer. The women were categorized according to dyslipidemia status. Bone mineral density was measured and compared between groups. Osteoporosis was statistically more frequent in women with hypertriglyceridemia who did not have endometrial cancer. In contrast, osteoporosis was statistically less frequent in women with hypertriglyceridemia who had endometrial cancer. In this cross-sectional study in a Japanese population, osteoporosis was associated with hypertriglyceridemia in post-menopausal women without endometrial cancer, but was less frequent in endometrial cancer survivors with hypertriglyceridemia.