Introduction: Diabetes mellitus (DM) refers to a group of common metabolic disorder that shares phenotype of hyperglycemia. In India, the prevalence rates are estimated to be around 10% in cities, and recent figures showed surprising increasing rates in rural areas. To ascertain the true prevalence in any community, it is essential that there must be standardized methods for the diagnosis with proper acceptable criteria so that the results are comparable. Aims: To determine the incidence of LV diastolic dysfunction in asymptomatic Type-II DM patients and to compare it with normal subjects and To quantify the relation of LV diastolic dysfunction with age, duration of DM, HbA1c, obesity indices and other diabetic complications Materials and Methods: The present study was a case-control study. This Study was conducted from April 2021 to November 2022 at Department of Medicine at PMCH, Patna. Result:Transmitral velocity data showed the significant low E/A ratio (E<A), prolonged declaration time (>240ms) and isovolumetric relaxation time (>110ms) in patients with diastolic dysfunction both in study group and control group. Conclusion: The incidence of diastolic dysfunction was found significantly high in newly diagnosed type 2 diabetes mellitus patients as compared with non-diabetic subjects. Prevalence of diastolic diastolic dysfunction in new diabetic population has female preponderance in the ratio of 2:1.