Kharkhorin (Mongolian: Хархорин) is a town and sum (district) center in Övörkhangai Province in Mongolia. The sum population is about 14,000. The population of Kharkhorin town itself about 9,000.

Kharkhorin is located at the lower end of the upper valley of the Orkhon River which is included within UNESCO's World Heritage Site Orkhon Valley Cultural Landscape. The location marks the easternmost foothills of the Khangai Mountains, where they meet the rolling steppe of central Mongolia.

Nearby are the ruins of the ancient town of Karakorum (also known as Kharkhorum or Qara Qorum) which, for a short time, served as the capital of the Mongol Empire under Ogedei Khan. Another Kharkhorin landmark is Erdene Zuu monastery and its famous phallic rock. The important Paleolithic archaeological site of Moiltyn-am is located near the bridge over the Orkhon River, just west of the settlement. A modern resort is south of Kharkhorin at Khujirt on the Orkhon River.