Background: Allergic Rhinitis (AR), a not-unusual health problem, imposes a large problem on public health. New proof shows a possible link between AR and vitamin D deficiency. Aim And Objective: This study was done to determine whether serum Vitamin D levels are altered in AR as compared to healthy controls.Materials and Methods: A cross-sectional study was performed on 100 adults aged 20–50 (50 clinically diagnosed with AR and 50 age and sex-matched controls). They were evaluated clinically and by determining serum levels of 25- hydroxyvitamin D [25(OH) D]. Results: The most common symptom was paroxysmal sneezing (82%). The mean and standard deviation concentration of serum 25(OH) D was 16.95 ± 3.77 ng/ml in patients and 24.25 ± 6.24 ng/ml in controls. This study demonstrated a statistically significant Vitamin D deficiency (defined as serum 25(OH) D, ≤ 20 ng/ml) among the patients with AR as compared to the healthy control (P-0.001). Conclusions: A strong association exists between low serum vitamin D ranges and AR in this population pattern of AR patients, suggesting that sub optimal ranges of vitamin D can also modify disordered behavior. Supplementation can be a ben