| Official Name: | Castromembibre, Spain |
| Subdivision Name3: | Castromembibre |
| Leader Title: | Mayor |
| Leader Name: | Inmaculada Alonso Cortés |
| Area Total Km2: | 16.6 |
| Elevation M: | 786 |
| Population Density Km2: | auto |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
Castromembibre is a municipality located in the province of Valladolid, Castile and León, Spain. According to the 2004 census (INE), the municipality has a population of 80 inhabitants.