Tsagan-Oluy () is a rural locality (a selo) in Borzinsky District, Zabaykalsky Krai, Russia. Population: There are 6 streets in this selo.
This rural locality is located 46 km from Borzya (the district's administrative centre), 312 km from Chita (capital of Zabaykalsky Krai) and 5,660 km from Moscow. Klyuchevskoye is the nearest rural locality.