Aim: To investigate the relation of vitamin D concentration and parathyroid hormone with insulin resistance in PCOS women. Methods: In the department of Obstetrics and Gynecology at Dr. Baba Saheb Ambedkar medical college & hospital Rohini Delhi, a one-year observational study was conducted. The levels of 25, hydroxyvitamin D and PTH, as well as the levels of fasting sugar and insulin in the blood, were tested. Results: There was a 91.0 percent prevalence of vitamin D insufficiency (