Ust-Dunguy (Russian: Усть-Дунгуй; Buryat: Дунгуйн Адаг, Dunguin Adag) is a rural locality (a selo) in Kyakhtinsky District, Republic of Buryatia, Russia.

Ust-Dunguy is located 124 km southeast of Kyakhta (the district's administrative centre) by road.

Anagustay is the nearest rural locality.

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