Nizhny Sayantuy (Russian: Нижний Саянтуй; Buryat: Доодо Саянта, Doodo Saianta) is a rural locality (a selo) in Tarbagataysky District, Republic of Buryatia, Russia.

Nizhny Sayantuy is located 36 km north of Tarbagatay (the district's administrative centre) by road.

Voznesenovka is the nearest rural locality.

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