| Official Name: | Pervomayskoye |
| Native Name: | Первомайское |
| Settlement Type: | Selo |
| Pushpin Map: | Russia Buryatia#Russia |
| Subdivision Type: | Country |
| Subdivision Name: | Russia |
| Subdivision Name1: | Republic of Buryatia |
| Subdivision Name3: | Kyakhtinsky District |
| Subdivision Type4: | Municipality |
| Utc Offset1: | +8:00 |
| Coordinates: | 50.1°N 133°W[1] |
Pervomayskoye (Russian: Первомайское) is a rural locality (a selo) in Kyakhtinsky District, Republic of Buryatia, Russia. The population was 133 as of 2010.[2] There are 4 streets.
Pervomayskoye is located 95 km southeast of Kyakhta (the district's administrative centre) by road. Ara-Altsagat is the nearest rural locality.[3]