Udinsk (Russian: Удинск; Buryat: Хахирай Үртөө, Khakhirai Ürtöö) is a rural locality (a selo) in Khorinsky District, Republic of Buryatia, Russia.

Udinsk is located 43 km west of Khorinsk (the district's administrative centre) by road.

Tarbagatay is the nearest rural locality.

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