Ust-Aleyka (Russian: Усть-Алейка) is a rural locality (a selo) and the administrative center of Ust-Aleysky Selsoviet of Kalmansky District, Altai Krai, Russia.

Ust-Aleyka is located 10 km south of Kalmanka (the district's administrative centre) by road.

Nagorny is the nearest rural locality.

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