Vitamin D deficiency is a significant health problem worldwide, it is a growing health problem among adults and children . In pregnant women Vitamin D deficiency had an increasing concern in several previous studies due to its possible effect on the maternal and fetal outcomes. This study aimed to assess the prevalence and the effect of VD deficiency on the pregnancy outcomes. Hence a total of 314 Iraqi pregnant women at first trimester were enrolled and followed during their gestation until delivery . Vitamin D level and other clinical and laboratory parameters were assessed at first visit. At subsequent visits and follow up the women were assessed clinically to detect any complication or adverse outcome during pregnancy, after birth neonates were clinically examined and all data reported. Data analysis revealed that vitamin D deficiency and insufficiency was highly prevalent among pregnant Iraqi women and associated with more frequent preeclampsia, small for gestational age, low birth weight and preterm birth and the covered style of dressing are associated with higher prevalence of VD deficiency.