| Official Name: | Castronuevo, Spain |
| Subdivision Name3: | Castronuevo |
| Area Total Km2: | 47 |
| Population Density Km2: | auto |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
Castronuevo is a municipality in the province of Zamora, Castile and León, Spain. According to the 2009 census (INE), the municipality has a population of 312 inhabitants.