| Official Name: | Ucero |
| Settlement Type: | Municipality |
| Coordinates: | 41.7169°N -3.0514°W |
| Pushpin Map: | Spain Castile and León#Spain |
| Pushpin Map Caption: | Location in Spain. |
| Subdivision Name3: | Ucero |
| Area Total Km2: | 17.13 |
| Elevation M: | 964 |
| Population Density Km2: | auto |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
Ucero 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 98 inhabitants.
It lies on the River Ucero which runs to El Burgo de Osma to the south and then into the River Duero, and is the natural entrance to the Cañón del Río Lobos Natural Park. It contains the castle of Ucero and several hermitages.