The last two decades have witnessed significant developments in the diagnosis and management of supraventricular and ventricular arrhythmias, especially in the high-income countries. Due to several factors that include the dynamic nature of these conditions, epidemiology and surveillance have not advanced to the same extent. In this chapter, the goal is to collate the existing literature on epidemiology and global burden of arrhythmias, recognizing that these data are also available from only a few of the world regions, mostly the high-income nations.