| Official Name: | San Martín de Valvení, Spain |
| Subdivision Name3: | San Martín de Valvení |
| Area Total Km2: | 58 |
| Population Density Km2: | auto |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
San Martín de Valvení 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 105 inhabitants.