| Official Name: | Sergeyevka |
| Native Name: | Сергеевка |
| Native Name Lang: | ru |
| Settlement Type: | Settlement |
| Pushpin Map: | Russia Voronezh Oblast#Russia |
| Subdivision Type: | Country |
| Subdivision Name: | Russia |
| Subdivision Type1: | Region |
| Subdivision Name1: | Voronezh Oblast |
| Subdivision Type2: | County |
| Subdivision Type3: | District |
| Subdivision Name3: | Ertilsky District |
| Subdivision Type4: | Municipality |
| Utc Offset1: | +3:00 |
| Coordinates: | 51.65°N 83°W[1] |
Sergeyevka (Russian: links=no|Сергеевка) is a rural locality (a settlement) in Pervomayskoye Rural Settlement, Ertilsky District, Voronezh Oblast, Russia. The population was 398 as of 2010.[2] There are 7 streets.[3]
Sergeyevka is located 30 km southwest of Ertil (the district's administrative centre) by road. Pervomaysky is the nearest rural locality.[4]