Khilgantuy (Russian: Хилгантуй; Buryat: Хилганта, Khilganta) is a rural locality (an ulus) in Kyakhtinsky District, Republic of Buryatia, Russia.

Khilgantuy is located 77 km northeast of Kyakhta (the district's administrative centre) by road.

Ust-Kiran is the nearest rural locality.

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