| Official Name: | Kostaikha |
| Native Name: | Костаиха |
| Settlement Type: | Village |
| Pushpin Map: | Russia Vologda Oblast#Russia |
| Subdivision Type: | Country |
| Subdivision Name: | Russia |
| Subdivision Name1: | Vologda Oblast |
| Subdivision Name3: | Tarnogsky District |
| Subdivision Type4: | Municipality |
| Utc Offset1: | +3:00 |
| Coordinates: | 60.6833°N 50°W[1] |
Kostaikha (Russian: Костаиха) is a rural locality (a village) in Spasskoye Rural Settlement, Tarnogsky District, Vologda Oblast, Russia. The population was 43 as of 2002.[2]
Kostaikha is located 38 km northwest of Tarnogsky Gorodok (the district's administrative centre) by road. Naumovskaya is the nearest rural locality.[3]