Background:Diabetes Mellitus (DM) is a major concern in India and has been described as a modern-day epidemic. It can affect nearly every organ and cause a slew of complications. Cardiac autonomic neuropathy (CAN) is a serious complication of diabetes. It is also one of the least diagnosed and understood diabetic complications. The purpose of this study was to determine the prevalence of CAN in diabetic patients and to investigate its relationship with the duration of DM and glycemic control.