Background: Indicators of the metabolic disorder known as metabolic syndrome (MS) include resistance to insulin, poor glucose tolerance, diabetes mellitus (DM), obesity, accumulation of abdominal fat, dyslipidemia, and hypertension. Objective:For evaluation the relationship between intake of vit D and the degree of insulin resistance in MS patients. Patients and Methods: A cross-sectional study was done in Benha University and Teaching Hospital's outpatient clinic. Adult patients with metabolic syndrome who were 18 years of age or older who attended to the outpatient clinic were the subjects of this study. Results: Our findings demonstrated that vitamin D levels of the diabetic and non-diabetic participants were equivalent, but there was a statistically significant relation between DM and HOMA-IR since diabetic patients had considerably higher levels of HOMA-IR than non-diabetics (P<0.001). Conclusion: According to our findings, vit D had a substantial negative correlation with HOMA-IR in both the general population and diabetes patients, with a greater vit D level resulting in a lower HOMA-IR level, as well as a significant negative link with BMI and WC.