| Official Name: | Nikolsk |
| Native Name: | Никольск |
| Settlement Type: | Selo |
| Pushpin Map: | Russia Buryatia#Russia |
| Subdivision Type: | Country |
| Subdivision Name: | Russia |
| Subdivision Name1: | Republic of Buryatia |
| Subdivision Name3: | Mukhorshibirsky District |
| Subdivision Type4: | Municipality |
| Utc Offset1: | +8:00 |
| Coordinates: | 51.1833°N 127°W[1] |
Nikolsk (Russian: Никольск) is a rural locality (a selo) in Mukhorshibirsky District, Republic of Buryatia, Russia. The population was 1,309 as of 2010.[2] There are 20 streets.
Nikolsk is located 45 km northeast of Mukhorshibir (the district's administrative centre) by road. Khonkholoy is the nearest rural locality.[3]