| Official Name: | Bulak |
| Native Name: | Булак |
| Settlement Type: | Ulus |
| 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: | 51.3°N 140°W[1] |
Bulak (Russian: Булак; Buriat: Булаг, Bulag) is a rural locality (an ulus) in Selenginsky District, Republic of Buryatia, Russia. The population was 21 as of 2010.[2]
Bulak is located 7 km northeast of Gusinoozyorsk (the district's administrative centre) by road. Gusinoozyorsk is the nearest rural locality.[3]