| Official Name: | Cubillas de Santa Marta, Spain |
| Subdivision Name3: | Cubillas de Santa Marta |
| Area Total Km2: | 23 |
| Population Density Km2: | auto |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
Cubillas de Santa Marta 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 292 inhabitants.