| Official Name: | Castilnuevo, Spain |
| Pushpin Map: | Spain Province of Guadalajara#Spain Castilla-La Mancha#Spain |
| Subdivision Name3: | Castilnuevo |
| Area Total Km2: | 19.54 |
| Population Density Km2: | auto |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
Castilnuevo is a municipality in the province of Guadalajara, Castile-La Mancha, Spain. It had 9 residents at the 2004 census (INE).