| Official Name: | Kostino-Otdelets |
| Native Name: | Костино-Отделец |
| Native Name Lang: | ru |
| Settlement Type: | Selo |
| 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: | Ternovsky District |
| Subdivision Type4: | Municipality |
| Utc Offset1: | +3:00 |
| Coordinates: | 51.5167°N 68°W[1] |
Kostino-Otdelets (Russian: links=no|Костино-Отделец) is a rural locality (a selo) and the administrative center of Kostino-Otdelskoye Rural Settlement, Ternovsky District, Voronezh Oblast, Russia. The population was 1,372 as of 2010.[2] There are 16 streets.[3]
Kostino-Otdelets is located 24 km southwest of Ternovka (the district's administrative centre) by road. Zarechye is the nearest rural locality.[4]