Vitamin D deficiency (VDD) is common in women with and without polycystic ovary disease(PCOD). There is evidence that Vitamin D has role in incidence of PCOD and may be associated with metabolic and endocrine disorders in PCOD. Obesity is associated with  low serum vitamin d level. The aim of this study is to know the prevalence of Vitamin D deficiency in PCOD patients versus normal population. METHOD–This  is comparative analytical study on two unpaired population by  using cross sectional study design.The  study was conducted in NMCH patna from October 2015 to January 2017.50 Patients suffering from PCOD and 50 patients attainding  Gynaecology OPD from other problem having regular menstrual cycle were studied. Serum vitamin D level and BMI  was measured. Results were classified as follows– Serum concentration of 25(OH)D was measured. Vitamin D deficiency were indicated as < 20 ng/ml, insufficiency as 21 – 29 ng/ml and sufficiency was defined as > 30 ng/ml.Results– in PCOD group 24% of  patients had normal serum Vitamin D level , 26% had insufficient and 50% had deficient level of serum  Vitamin D. In control group  56% women had normal value, 26%  insufficient  and 20%  were deficient of Vitamin D.Mean serum Vitamin D level was 22.6 in PCOD group as compared to control 30.88 . In  PCOD  group Vitamin D level  was lower in obese patients. Conclusion–This  study   found  significant lower  level of Vitamin D in PCOD patients