Chagan-Uzun (Russian: Чаган-Узун; Altay: Чаган-Узун, Çagan-Uzun) is a rural locality (a selo) in Kosh-Agachsky District, the Altai Republic, Russia.

Chagan-Uzun is located 29 km northwest of Kosh-Agach (the district's administrative centre) by road.

Ortolyk is the nearest rural locality.

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