Background: Vitamin D deficiency is the most prevalent dietary deficit, and it is a worldwide epidemic in Saudi Arabia. Methods: A cross-sectional study was conducted among the general population in Al-Qurayyat city during the period from 10 October to 17 October. Both genders were included with age ranged from 20-40 years. A questionnaire was used in this study. Questionnaire consisted of groups of questions to determine the most common risk factors related to vitamin D deficiency.Results: A total of 105 participants with both genders 93 females and 12males were included in the study. Age was positively correlated with vitamin D level. There was a significant inverse correlation between serum 25 (OH) D concentrations and duration of sun exposure.Conclusion: The etiology of the high prevalence of vitamin D deficiency in our study is multifactorial, where lack of sunlight exposure and inadequate diet are the most important factors.