| Official Name: | Ust-Bryan |
| Native Name: | Усть-Брянь |
| Settlement Type: | Selo |
| Pushpin Map: | Russia Buryatia#Russia |
| Subdivision Type: | Country |
| Subdivision Name: | Russia |
| Subdivision Name1: | Republic of Buryatia |
| Subdivision Name3: | Zaigrayevsky District |
| Subdivision Type4: | Municipality |
| Utc Offset1: | +8:00 |
| Coordinates: | 51.9333°N 116°W[1] |
Ust-Bryan (ru|Усть-Брянь) is a rural locality (a selo) in Zaigrayevsky District, Republic of Buryatia, Russia. The population was 1,395 as of 2010.[2] There are 22 streets.
Ust-Bryan is located 19 km northwest of Zaigrayevo (the district's administrative centre) by road. Imeni Serova is the nearest rural locality.[3]