Nizhny Uymon (Russian: Нижний Уймон; Altay: Алтыгы-Оймон, Altıgı-Oymon) is a rural locality (a selo) in Ust-Koksinsky District, the Altai Republic, Russia.

Nizhny Uymon is located 25 km southeast of Ust-Koksa (the district's administrative centre) by road.

Multa and Zamulta are the nearest rural localities.

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