| Official Name: | Yermachikha |
| Native Name: | Ермачиха |
| Settlement Type: | Village |
| 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: | 53.0333°N 118°W[1] |
Yermachikha (Russian: Ермачиха) is a rural locality (a selo) and the administrative center of Mamontovsky District, Altai Krai, Russia. The population was 394 in 2014.[2] There are 7 streets.
Yermachikha is located on the Yermachikha River, 53 km north of Mamontovo (the district's administrative centre) by road. Korchino is the nearest rural locality.[3]