Introduction: Diabetes Mellitus is a categorized as a disease with multi-system complications. Congestive heart failure is one of the last resorts of cardiovascular complications, and is featured by the presence of diabetic cardiomyopathy, indicated by diastolic left ventricular dysfunction, which is easily assessed clinically and with echocardiography. Objective: To study the prevalence of LV diastolic dysfunction in asymptomatic patients diagnosed as diabetes mellitus. Method: The study was carried out on 100 diabetics and compared with 100 age and sex matched controls. In all the patients, complete history, general examination and relevant investigations was done to find out the prevalence of diastolic dysfunction in patients of diabetes mellitus. Results: The prevalence of diastolic dysfunction, defined by echocardiograph criteria was observed in 53% of total subjects. E/A was a sensitive index of diastolic LV dysfunction. Left ventricular hypertrophy, as indicated by an increased LV mass, was an early marker of diabetic cardiomyopathy. Conclusion: Echocardiography is a sensitive method to investigate the diastolic dysfunction. There is a high prevalence of diastolic dysfunction in diabetes, which is an early marker of diabetic cardiomyopathy.