| Official Name: | Castro de Fuentidueña |
| Settlement Type: | Municipality |
| Pushpin Map: | Spain Castile and León#Spain |
| Pushpin Map Caption: | Location in Spain. |
| Subdivision Name3: | Castro de Fuentidueña |
| Area Total Km2: | 19 |
| Population Density Km2: | auto |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
Castro de Fuentidueña is a municipality located in the province of Segovia, Castile and León, Spain. According to the 2004 census (INE), the municipality has a population of 73 inhabitants.