Ust-Altasha (Russian: Усть-Алташа; Buryat: Алташын Адаг, Altashyn Adag) is a rural locality (an ulus) in Mukhorshibirsky District, Republic of Buryatia, Russia.

Ust-Altasha is located 65 km west of Mukhorshibir (the district's administrative centre) by road.

Zurgan-Debe is the nearest rural locality.

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