| Tera | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Spain |
| Subdivision Type2: | Region |
| Subdivision Name2: | Castile and Leon |
| Length: | 139.82km (86.88miles) |
| Mouth Location: | River Esla, Bretocino |
| Mouth Coordinates: | 41.8992°N -5.7395°W |
| Basin Size: | 2412km2 |
The Tera is a river in the north of Spain, a tributary of the River Esla.
It is of ecological importance, being the home of 24 species of the European Union Nature Directives. Riberas del Río Tera y afluentes was designated a Special Area of Conservation in 2015.[1]