Abstract Background: Counseling is a short term process helps to bring change in life, change in thought, and change in behavior. Vitamin D deficiency is present in high percentage in pregnant women and caused adverse maternal and fetal complications as gestational diabetes, preeclampsia, low birth weight and preterm labor. The aim of this study was to evaluate the effect of counseling about vitamin D deficiency on pregnant women in Ab-teg Health Center. Samples: A convenient sample of 400 pregnant women. Research design: a quasi – experimental design was applied in this study. Setting: The study was conducted in six places of maternal and child health centers of Abo-teg city and it's villages. Tools: Structured interviewing questionnaire were utilized for data collection and pre-post counseling questionnaire to evaluated the effect of counseling on vitamin D. Results: Most of participated women in this study under 30 years, there were a statistically significant increase in studied women general knowledge about vitamin (p < 0.01) after counseling. Conclusion: Counseling on vitamin D deficiency is effective and pregnant women`s knowledge towards vitamin D deficiency and its effect on pregnancy outcomes become adequate. Recommendations: The study recommended conducting awareness sessions on vitamin D and its importance for the expectant mothers and their children to improve pregnancy outcomes.