Aim: Vitamin D has many known benefits. One of them is that it is immunomodulator. It is also protective against upper respiratory tract infections. It was aimed to examine vitamin D levels in Covid 19 patients, who can cause multi-organ failure and death from asymptomatic infection. Materials and Methods: 580 patients with positive Real Time-Polymerase Chain Reaction (RT-PCR, PCR) test registered in our family medicine system were scanned from the national health data system and 91 patients whose vitamin D levels were checked recently were included in the research group. In addition, 91 people with negative PCR tests with the same characteristics were taken as the control group. Their vitamin D levels were taken from the national health data system. Results: The average age of the Covid 19 patient group was 53, while the control group was 55 years, it was observed 39.60% of the participants were male and 60.40% were female. Vitamin D levels of positive patients, 69.20% (<20 ng / mL) deficiency, 23.10% (20-30 ng / mL) insufficiency, 7.70% (30-149 ng/mL) was found to be optimal and the average vitamin D is 17.61 ng / ml. The vitamin D levels of the control group were found to be 58.20% deficiency, 24.20% insufficiency, 17.60% (30-149) optimal, and the average was 20.75 ng / ml. Conclusion: Vitamin D deficiency is more common in Covid 19 patients, and the average of vitamin D is generally lower in Covid 19 patients. Vitamin D supplementation is important in our fight against Covid 19. Keywords: Covid-19, vitamin D, immunity, level