| Official Name: | Nikolayevsky |
| Native Name: | Николаевский |
| Settlement Type: | Settlement |
| Pushpin Map: | Russia Buryatia#Russia |
| Subdivision Type: | Country |
| Subdivision Name: | Russia |
| Subdivision Name1: | Republic of Buryatia |
| Subdivision Name3: | Tarbagataysky District |
| Subdivision Type4: | Municipality |
| Utc Offset1: | +8:00 |
| Coordinates: | 51.65°N 155°W[1] |
Nikolayevsky (Russian: Николаевский) is a rural locality (a settlement) in Tarbagataysky District, Republic of Buryatia, Russia. The population was 1,295 as of 2010.[2] There are 26 streets.
Nikolayevsky is located 43 km northeast of Tarbagatay (the district's administrative centre) by road. Lesnoy is the nearest rural locality.[3]