| Official Name: | Ulyun |
| Native Name: | Улюн |
| Settlement Type: | Ulus |
| Pushpin Map: | Russia Buryatia#Russia |
| Subdivision Type: | Country |
| Subdivision Name: | Russia |
| Subdivision Name1: | Republic of Buryatia |
| Subdivision Name3: | Barguzinsky District |
| Subdivision Type4: | Municipality |
| Utc Offset1: | +8:00 |
| Coordinates: | 53.8167°N 163°W[1] |
Ulyun (Russian: Улюн) is a rural locality (an ulus) in Barguzinsky District, Republic of Buryatia, Russia. The population was 1,061 as of 2010.[2] There are 18 streets.
Ulyun is located 32 km northeast of Barguzin (the district's administrative centre) by road. Ulyukchikan is the nearest rural locality.[3]