Women with polycystic ovarian syndrome have abnormalities in the metabolism of androgens and oestrogen. Although the exact etiopathophysiology of this condition is unclear, PCOS or HA-PODS can result from abnormal function of hypothalamic- pituitary- ovarian axis. PCOS is associated with peripheral insulin resistance and hyperinsulinemia, and obesity amplifies the degree of both abnormalities. The prevalence of HA-PODS is more among obese women. We conducted this study in the department of Obstetrics and Gynaecology, RMMC&H, Annamalai University to know the prevalence of PCOS or HA-PODS among obese women attending infertility clinic. 50 obese and 50 lean women with infertility were included in this study and the prevalence calculated in both groups.