| Official Name: | Syoyka |
| Native Name: | Сёйка |
| Settlement Type: | Village |
| Pushpin Map: | Russia Altai Republic#Russia |
| Subdivision Type: | Country |
| Subdivision Name: | Russia |
| Subdivision Name1: | Altai Republic |
| Subdivision Name3: | Choysky District |
| Subdivision Type4: | Municipality |
| Utc Offset1: | +7:00 |
| Coordinates: | 51.8833°N 130°W[1] |
Syoyka (Russian: Сёйка; Southern Altai: Соой, Sooy) is a rural locality (a selo) in Choyskoye Rural Settlement of Choysky District, the Altai Republic, Russia. The population was 1,520 as of 2016.[2] There are 16 streets.
Syoyka is located on the Seyka River, 27 km southeast of Choya (the district's administrative centre) by road. Ynyrga is the nearest rural locality.[3]