Ardon River (Russian: Ардон, Ossetian: Æрыдон, Ærydon) is a river in North Ossetia–Alania in Russia. It flows north and somewhat east to join the Terek River northwest of Vladakavkaz. Its main tributary is the Fiagdon River which parallels it on the east and joins it near its mouth. The length of the Ardon is 102 km, the area of its drainage basin is 2700 km². The Ardon originates in the glaciers of the Greater Caucasus. The Ossetian Military Road crossed the valley of the Ardon River.