Ust-Muya (Russian: Усть-Муя; Buryat: Муяын Адаг, Muiayn Adag) is a rural locality (a settlement) in Muysky District, Republic of Buryatia, Russia.

Ust-Muya is located 59 kilometres (37 mi) east of Taksimo (the district's administrative centre) by road.

Muya is the nearest rural locality.

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