Abstract Purpose: Obesity is increasing in prevalence worldwide and represents a major international health burden. Pediatric obesity has increased during the prior two decades. Vitamin D plays important roles in promoting bone homeostasis and protecting against cardiovascular events. Several studies have linked vitamin D deficiency and obesity in adult populations. We sought to assess the relationship between serum vitamin D and obesity in children in Saudi Arabia. Materials and Methods: Pediatric outpatients who were 5-14 years of age were included in this study. Body mass index (BMI) was used to classify patients as follows: BMI