Subuktuy (Russian: Субуктуй; Buryat: Һубагтай, Hubagtai) is a rural locality (an ulus) in Kyakhtinsky District, Republic of Buryatia, Russia.

Subuktuy is located 31 km north of Kyakhta (the district's administrative centre) by road.

Ust-Kyakhta is the nearest rural locality.

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