Polycystic ovary syndrome is one of the most chronic diseases affecting women. Some studies indicate that the level of vitamin D is related to the development of polycystic ovary syndrome. This vitamin-like hormone has a certain effect on insulin sensitivity and restoring reproductive capacity in women with polycystic ovary syndrome. Therefore, it was planned to study the relationship between vitamin D deficiency and PCOS. This study planned to show the relationship between vitamin D deficiency, total cholesterol level, and the appearance of polycystic ovary syndrome in patients attending Kirkuk General Hospital.