Background: The reduction of bone density in postmenopausal women has been related to a subclinical vitamin D deficiency, which is considered a risk factor for fractures due to this population's sensitivity to falls and improper neuromuscular responses. The present study aimed to study the Prevalence of Vitamin D Level Deficiency and its association with Bone Mineral Density in post-menopausal women. Material and Method: This prospective observational study was conducted among the females attending to hospital with complain of pain over lower back and hip pain to Father Muller Medical College & Hospital, Mangalore. The participants were enrolled during the period of Jan 2018 to July 2018, among females attending to hospital. Females more than 45yrs of age, with menopause of more than 2yr history and patients willing to be part of study were included in study. the participants less than 45yrs of age, patients with liver disease, kidney disease, malignancies, on steroid therapy, on vitamin D supplementation and patients not willing to be part of study were excluded from the study. The study was approved by institutional ethics committee and patients were enrolled in study after obtaining the informed consent. the patients underwent physical and biochemical examination. The vitamin D levels were measure and the bone mineral density was measure by DEXA scan. The data were entered in excel sheet and analysed using SPSS v26.0 operating on windows 10 and a p-value of <0.05 was considered statistically significant.