| Official Name: | Fuentelsaz de Soria |
| Settlement Type: | Municipality |
| Coordinates: | 41.8661°N -2.4147°W |
| Pushpin Map: | Spain Castile and León#Spain |
| Pushpin Map Caption: | Location in Spain. |
| Subdivision Type: | Country |
| Subdivision Type1: | Autonomous community |
| Subdivision Type2: | Province |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Fuentelsaz de Soria |
| Area Total Km2: | 26 |
| Elevation M: | 1078 |
| Population Density Km2: | auto |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
Fuentelsaz de Soria is a municipality located in the province of Soria, Castile and León, Spain. According to the 2004 census (INE), the municipality has a population of 53 inhabitants.