The Ardon (Russian: Ардон, Ossetian: Ӕрыдон, Ærydon) is a river in North Ossetia–Alania in Russia, a left tributary of the Terek.

Its main tributary is the Fiagdon which parallels it on the east and joins it near its mouth.

Once the river enters the plain near the city of Alagir, its waters are used for irrigation purposes.

Along a section of the river with a length of 16 km from the village of Nizhniy Zaramag to the confluence of the Baddon River, there is a cascade of operating Zaramag hydropower plants, including the Golovnaya HPP with a capacity of 15 MW and the Zaramagskaya HPP-1 with a capacity of 346 MW.

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