| Ertil | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Russia |
| Subdivision Type3: | Region |
| Subdivision Name3: | Voronezh Oblast, Tambov Oblast |
| Length: | 92km (57miles) |
| Source1 Elevation: | 180m (590feet) |
| Mouth: | Bityug |
| Mouth Coordinates: | 51.7742°N 40.4978°W |
| Mouth Elevation: | 107m (351feet) |
| Progression: | Bityug→ |
| Basin Size: | 931km2 |
The Ertil (Russian: Эртиль) is a river within the basin of the Don in Voronezh Oblast and Tambov Oblast, Russia. It is long, and has a drainage basin of .[1] The Ertil is a left tributary of the Bityug.