Background: Coronary circulation is the circulation of blood in the blood vessels that supply the heart muscle (myocardium). Coronary arteries supply oxygenated bloodto the heart muscle. Cardiac veins then drain away the blood after it has been deoxygenated. Because the rest of the body, and most especially the brain, needs a steady supply of oxygenated blood that is free of all but the slightest interruptions, the heart is required to function continuously. Therefore its circulation is of major importance not only to its own tissues but to the entire body and even the level of consciousness of the brain from moment to moment. Interruptions of coronary circulation quickly cause heart attacks (myocardial infarctions), in which the heart muscle is damaged by oxygen starvation. Such interruptions are usually caused by coronary ischemia linked to coronary artery disease, and sometimes to embolism from other causes like obstruction in blood flow through vessels. Aims & Objectives: The aim of this study is to know the association of cardiovascular diseases and coronary dominance of Central Rajasthan population. Materials& Methods:Male and female patients of age group of 30-70 years who present to the Cath lab of Cardiology Department of J.L.N. Hospital, Ajmer for coronary angiography for different indications are included in the study.Patients with history of Myocardial infarction, Angina pectoris, Congestive Heart failure and Arrythmia were included in this study. Results: This study shows significant correlation between cardiovascular diseases and coronary dominance. Conclusion: This study shows maximum percentage of cases that is 56.60 are recorded with ST-elevated myocardial infarction in the age group of 41-50 years and the least number of cases are recorded with arrythmia i.e. 1.69% in the age group of 61-70 years.