Tsagatuy (Russian: Цагатуй; Buryat: Сагаатай, Sagaatai) is a rural locality (a selo) and the administrative centre of Tsagatuyskoye Rural Settlement, Dzhidinsky District, Republic of Buryatia, Russia.

Tsagatuy is located 13 km north of Petropavlovka (the district's administrative centre) by road.

Dede-Ichyotuy is the nearest rural locality.

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