| Official Name: | Sardón de Duero, Spain |
| Subdivision Name3: | Sardón de Duero |
| Area Total Km2: | 19 |
| Population Density Km2: | auto |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
Sardón de Duero is a municipality in the province of Valladolid, Castile and León, Spain. According to the 2004 census (INE), the municipality has a population of 668 inhabitants. There is a factory producing mantecadas in Sardón de Duero, as well as the Monastery of Santa María de Retuerta.