Background: Despite of sufficient and stable sunny conditions across the equatorial countries, there has been a high prevalence of Vitamin D deficiency (VDD) in pregnancy. The reasons for increased prevalence of VDD are increased time spent indoors, dark skin, and adoption of covered clothing due to religious & cultural reasons, low socio-economic status that leads to chronically poor diet. The present study was undertaken to find Vitamin D deficiency in the pregnant women of North East India and to find the adverse feto-maternal outcomes associated with VDD. Methods: This prospective study was conducted in the Department of Obstetrics & Gynaecology, Gauhati Medical College & Hospital, Guwahati, Assam, and India over a period of one year. Sample size was 150 pregnant women attending antenatal clinic. Results: Out of 150 pregnant women 66 (44%) had deficient, 41 (27.3%) had insufficient and 43 (28.7%) had sufficient vitamin D levels. VDD was seen in extremes of age groups i.e. group ≤ 20 years and 31- 35 years. Multiparity and low socio-economic status was associated with vitamin D deficiency and insufficiency, no association was found between VDD and religion (Hindu & Muslim). There was significant association between Vitamin D deficiency and insufficiency and occurrence of gestational hypertensive diseases and low birth weight babies. Rate of primary caesarean section was significantly high in vitamin D deficient women. No association was found between VDD and PROM/PPROM, preterm births, gestational diabetes mellitus and neonatal jaundice.