Harqin Left Wing Mongolian Autonomous County, also abbreviated as Harqin County or Kazuo County, is a Mongolian autonomous county in the west of Liaoning province, China. It is under the administration of Chaoyang City, 77 km (48 mi) to the northeast, and has a population of 346,133 (2020) residing in an area of 2,240 km2 (860 sq mi). Formerly known as Harqin Left Wing Banner (喀喇沁左翼旗).