| Official Name: | Pervomaysky |
| Native Name: | Первомайский |
| Settlement Type: | Settlement |
| Pushpin Map: | Russia Altai Krai#Russia |
| Subdivision Type: | Country |
| Subdivision Name: | Russia |
| Subdivision Name1: | Altai Krai |
| Subdivision Name3: | Mamontovsky District |
| Subdivision Type4: | Municipality |
| Utc Offset1: | +7:00 |
| Coordinates: | 52.9167°N 120°W[1] |
Pervomaysky (Russian: Первомайский) is a rural locality (a settlement) and the administrative center of Timiryazevsky Selsoviet of Mamontovsky District, Altai Krai, Russia. The population was 666 in 2016.[2] There are 11 streets.
Pervomaysky is located 36 km north of Mamontovo (the district's administrative centre) by road. Komsomolsky is the nearest rural locality.[3]