Udunga (Russian: Удунга; Buryat: Үдэнгэ, Üdenge) is a rural locality (an ulus) in Selenginsky District, Republic of Buryatia, Russia.

Udunga is located 80 km southwest of Gusinoozyorsk (the district's administrative centre) by road.

Ust-Urma is the nearest rural locality.

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