Background And Objective:  Poor sunlight exposure leads to vitamin D deficiency even in the sunniest places. So screening for vitamin D deficiency in outpatient clinics and inhospital setting in King Fahad Hospital , Al Madina Al Monwara. METHODS:  Screening for vitamin D deficiency by assessment of serum 25(OH)D with radioimmunoassay in 60 female patients aged 18 – 40 years. Serum calcium, phosphorous and alkaline phosphatase were assessed, too. Results:  6 female patients (10%) showed significant vitamin D deficiency with 25(OH) D < 20 ng/ml. However 54 female patients (90%) showed severe vitamin D deficiency with 25 (OH) D < 10 ng/ml. Conclusion:  Vitamin D deficiency is very common in Saudia Arabia especially females due to poor sunlight exposure. So being underrecognized and undertreated, vitamin D deficiency represents an important health problem in MADINA REGION, KSA.