| Official Name: | Nizhny Ubukun |
| Native Name: | Нижний Убукун |
| Settlement Type: | Selo |
| Pushpin Map: | Russia Buryatia#Russia |
| Subdivision Type: | Country |
| Subdivision Name: | Russia |
| Subdivision Name1: | Republic of Buryatia |
| Subdivision Name3: | Selenginsky District |
| Subdivision Type4: | Municipality |
| Utc Offset1: | +8:00 |
| Coordinates: | 51.5167°N 159°W[1] |
Nizhny Ubukun (Russian: Нижний Убукун; Buriat: Доодо Бγхэн, Doodo Bükhen) is a rural locality (a selo) in Selenginsky District, Republic of Buryatia, Russia. The population was 207 as of 2010.[2]
Nizhny Ubukun is located 42 km northeast of Gusinoozyorsk (the district's administrative centre) by road. Khargana is the nearest rural locality.[3]