Udinsk (Russian: Удинск; Buryat: Хахирай Үртөө, Khakhirai Ürtöö) is a rural locality (a selo) in Khorinsky District, Republic of Buryatia, Russia. The population was 719 as of 2010.[2] There are 10 streets.
Udinsk is located 43 km west of Khorinsk (the district's administrative centre) by road. Tarbagatay is the nearest rural locality.[3]