Tugnuy (Russian: Тугнуй; Buryat: Тγгнэ, Tügne) is a rural locality (a selo) in Mukhorshibirsky District, Republic of Buryatia, Russia.

Tugnuy is located 40 km northeast of Mukhorshibir (the district's administrative centre) by road.

Bom is the nearest rural locality.

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