| Official Name: | Kapustinka |
| Native Name: | Капустинка |
| Settlement Type: | Settlement |
| Pushpin Map: | Russia Altai Krai#Russia |
| Subdivision Type: | Country |
| Subdivision Name: | Russia |
| Subdivision Name1: | Altai Krai |
| Subdivision Name3: | Bayevsky District |
| Subdivision Type4: | Municipality |
| Utc Offset1: | +7:00 |
| Coordinates: | 53.3167°N 139°W[1] |
Kapustinka (Russian: Капустинка) is a rural locality (a settlement) in Proslaukhinsky Selsoviet, Bayevsky District, Altai Krai, Russia. The population was 40 as of 2013.[2] There are 3 streets.
Kapustinka is located near the Kulunda River 19 km northeast of Bayevo (the district's administrative centre) by road. Proslaukha is the nearest rural locality.[3]