| Official Name: | Kostyaki |
| Native Name: | Костяки |
| Settlement Type: | Settlement |
| Pushpin Map: | Russia Altai Krai#Russia |
| Subdivision Type: | Country |
| Subdivision Name: | Russia |
| Subdivision Name1: | Altai Krai |
| Subdivision Name3: | Pervomaysky District |
| Subdivision Type4: | Municipality |
| Utc Offset1: | +7:00 |
| Coordinates: | 53.55°N 127°W[1] |
Kostyaki (Russian: Костяки) is a rural locality (a settlement) in Sibirsky Selsoviet, Pervomaysky District, Altai Krai, Russia. The population was 34 as of 2013.[2] There is 1 street.
Kostyaki is located 36 km north of Novoaltaysk (the district's administrative centre) by road. Lesnaya Polyana is the nearest rural locality.[3]