Kuyagan (Russian: Куяган) is a rural locality (a selo) and the administrative center of Kuyagansky Selsoviet, Altaysky District, Altai Krai, Russia.

Kuyagan is located on the Kuyagan River, 52 km southwest of Altayskoye (the district's administrative centre) by road.

Kazanka is the nearest rural locality.

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