Aim: A study to correlate Vit D levels and bone mineral density in reproductive and postmenopausal women in north India. Material and methods: It is a case control study having the sample size of 80 (40 in each group). Subjects above the age of 30 years of age attending Obstetrics and Gynaecology OPD and undergoing Advanced Well-Women check up were included in the study. This study was conducted to evaluate the correlation of vit D levels and Bone Mineral Density in Reproductive and Postmenopausal women attending out-patient department of Obstetrics and Gynaecology of our institute. Patients were divided equally into two groups. Group A (Case) women above the age of 45 years/ attained Menopause.Group B (Control) women between age group of 30-45 years. Results: Normal BMD in group A was present in 4.55%,9.09%, 40.91%, 45.45% subjects with underweight, normal BMI, overweight, and class I obesity respectively as shown in table 7. 42.86% and 57.14% subjects had osteopenia while as osteoporosis was present in 25%, 25% and 50% subjects with underweight, normal BMI and overweight respectively. p-value = 0.0001(significant). Normal BMD was present in 6.06%, 21.21%, 42.42%, 30.30% subjects in group B with underweight, normal BMI, overweight, and class I obesity respectively as shown in table 7. 28.57%, 57.14% and 14.29% subjects with normal BMI, overweight and class I obesity had osteopenia respectively. p-value = < 0.0001(significant). Conclusion: It is concluded that vitamin-D levels were deficient in one-third of women in both reproductive and postmenopausal age group.