1.1. Background: Type 2 diabetes mellitus and hypertension are two important public health challenges, and both are linked to increased risk of cardiovascular events. Hyperuricemia has re cently emerged as an independent risk factor in the development of type 2 diabetes mellitus and hypertension through several pro posed mechanisms. These include endothelial dysfunction leading to vascular remodeling, inhibition of proliferation and migration of endothelial cells and NO secretion, formation of peroxynitrite through uric acid depended reactive oxygen species and NO and promoting L-arginine degradation. As a result of the effects of hy perglycemia and neurohormonal activation, UA levels are inde pendently associated with endothelial dysfunction in animals and humans, thereby promoting hypertension.[12] This study was un dertaken to find out the possible association of hyperuricemia and nitric oxide on patients with diabetes and hypertension. 1.2. Methods and Materials: The study was carried in a medical college of South India with a sample size of 186 patients which were divided into 4 groups – Group 1- healthy patients, Group 2 – patients with DM, Group 3- patients with DM and HTN, and Group 4 – patients with CAD with DM. Blood samples for serum uric acid , fasting blood sugar, nitric oxide and HbA1c and anthro pometric measurements ( height and weight for BMI) were taken. The data obtained was analyzed with IBM SPSS Statistics for Win dows, Version 20.0., IBM Corp., Chicago, IL and t-test was used to compare the results of various parameters among the studied groups. Linear regression analysis (Person correlation coefficient, r) was performed for determining the degree of association be tween different parameters. All values expressed as mean±SD, and P values of