Tsagan-Usun (Russian: Цаган-Усун; Buryat: Сагаан уһан, Sagaan uhan) is a rural locality (a selo) in Dzhidinsky District, Republic of Buryatia, Russia.

Tsagan-Usun is located 74 km southeast of Petropavlovka (the district's administrative centre) by road.

Naushki is the nearest rural locality.

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